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readable-pylint-messages

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List of pylint human readable message ids and dev readable codes

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# Readable pylint messages

Goal of the repo is to prepare and present README with list of messages.
Prepared with `pylint --list-msgs` for pylint v2.2.2

## blacklisted-name

#### C0102 - Black listed name "%s"

Used when the name is listed in the black list (unauthorized names).

## invalid-name

#### C0103 - %s name "%s" doesn't conform to %s

Used when the name doesn't conform to naming rules associated to its
type (constant, variable, class...).

## missing-docstring

#### C0111 - Missing %s docstring

Used when a module, function, class or method has no docstring.Some
special methods like **init** doesn't necessary require a docstring.

## empty-docstring

#### C0112 - Empty %s docstring

Used when a module, function, class or method has an empty docstring (it
would be too easy ;).

## unneeded-not

#### C0113 - Consider changing "%s" to "%s"

Used when a boolean expression contains an unneeded negation.

## singleton-comparison

#### C0121 - Comparison to %s should be %s

Used when an expression is compared to singleton values like True, False
or None.

## misplaced-comparison-constant

#### C0122 - Comparison should be %s

Used when the constant is placed on the left side of a comparison. It is
usually clearer in intent to place it in the right hand side of the
comparison.

## unidiomatic-typecheck

#### C0123 - Using type() instead of isinstance() for a typecheck.

The idiomatic way to perform an explicit typecheck in Python is to use
isinstance(x, Y) rather than type(x) == Y, type(x) is Y. Though there
are unusual situations where these give different
results.

## consider-using-enumerate

#### C0200 - Consider using enumerate instead of iterating with range and len

Emitted when code that iterates with range and len is encountered. Such
code can be simplified by using the enumerate
builtin.

## consider-iterating-dictionary

#### C0201 - Consider iterating the dictionary directly instead of calling .keys()

Emitted when the keys of a dictionary are iterated through the .keys()
method. It is enough to just iterate through the dictionary itself, as
in "for key in dictionary".

## bad-classmethod-argument

#### C0202 - Class method %s should have %s as first argument

Used when a class method has a first argument named differently than the
value specified in valid-classmethod-first-arg option (default to
"cls"), recommended to easily differentiate them from regular instance
methods.

## bad-mcs-method-argument

#### C0203 - Metaclass method %s should have %s as first argument

Used when a metaclass method has a first argument named differently than
the value specified in valid-classmethod-first-arg option (default to
"cls"), recommended to easily differentiate them from regular instance
methods.

## bad-mcs-classmethod-argument

#### C0204 - Metaclass class method %s should have %s as first argument

Used when a metaclass class method has a first argument named
differently than the value specified in
valid-metaclass-classmethod-first-arg option (default to "mcs"),
recommended to easily differentiate them from regular instance methods.

## single-string-used-for-slots

#### C0205 - Class **slots** should be a non-string iterable

Used when a class **slots** is a simple string, rather than an iterable.

## line-too-long

#### C0301 - Line too long (%s/%s)

Used when a line is longer than a given number of characters.

## too-many-lines

#### C0302 - Too many lines in module (%s/%s)

Used when a module has too many lines, reducing its readability.

## trailing-whitespace

#### C0303 - Trailing whitespace

Used when there is whitespace between the end of a line and the newline.

## missing-final-newline

#### C0304 - Final newline missing

Used when the last line in a file is missing a newline.

## trailing-newlines

#### C0305 - Trailing newlines

Used when there are trailing blank lines in a file.

## multiple-statements

#### C0321 - More than one statement on a single line

Used when more than on statement are found on the same line.

## superfluous-parens

#### C0325 - Unnecessary parens after %r keyword

Used when a single item in parentheses follows an if, for, or other
keyword.

## bad-whitespace

#### C0326 - %s space %s %s %s

Used when a wrong number of spaces is used around an operator, bracket
or block opener.

## mixed-line-endings

#### C0327 - Mixed line endings LF and CRLF

Used when there are mixed (LF and CRLF) newline signs in a
file.

## unexpected-line-ending-format

#### C0328 - Unexpected line ending format. There is '%s' while it should be '%s'.

Used when there is different newline than expected.

## bad-continuation

#### C0330 - Wrong %s indentation%s%s.

TODO

## wrong-spelling-in-comment

#### C0401 - Wrong spelling of a word '%s' in a comment:

Used when a word in comment is not spelled correctly.

## wrong-spelling-in-docstring

#### C0402 - Wrong spelling of a word '%s' in a docstring:

Used when a word in docstring is not spelled correctly.

## invalid-characters-in-docstring

#### C0403 - Invalid characters %r in a docstring

Used when a word in docstring cannot be checked by enchant.

## multiple-imports

#### C0410 - Multiple imports on one line (%s)

Used when import statement importing multiple modules is detected.

## wrong-import-order

#### C0411 - %s should be placed before %s

Used when PEP8 import order is not respected (standard imports first,
then third-party libraries, then local imports)

## ungrouped-imports

#### C0412 - Imports from package %s are not grouped

Used when imports are not grouped by packages

## wrong-import-position

#### C0413 - Import "%s" should be placed at the top of the module

Used when code and imports are mixed

## useless-import-alias

#### C0414 - Import alias does not rename original package

Used when an import alias is same as original package.e.g using import
numpy as numpy instead of import numpy as
np

## len-as-condition

#### C1801 - Do not use `len(SEQUENCE)` to determine if a sequence is empty

Used when Pylint detects that len(sequence) is being used inside a
condition to determine if a sequence is empty. Instead of comparing the
length to 0, rely on the fact that empty sequences are false.

## syntax-error

#### E0001 -

Used when a syntax error is raised for a module.

## unrecognized-inline-option

#### E0011 - Unrecognized file option %r

Used when an unknown inline option is encountered.

## bad-option-value

#### E0012 - Bad option value %r

Used when a bad value for an inline option is encountered.

## init-is-generator

#### E0100 - **init** method is a generator

Used when the special class method **init** is turned into a generator
by a yield in its body.

## return-in-init

#### E0101 - Explicit return in **init**

Used when the special class method **init** has an explicit return
value.

## function-redefined

#### E0102 - %s already defined line %s

Used when a function / class / method is redefined.

## not-in-loop

#### E0103 - %r not properly in loop

Used when break or continue keywords are used outside a loop.

## return-outside-function

#### E0104 - Return outside function

Used when a "return" statement is found outside a function or method.

## yield-outside-function

#### E0105 - Yield outside function

Used when a "yield" statement is found outside a function or method.

## nonexistent-operator

#### E0107 - Use of the non-existent %s operator

Used when you attempt to use the C-style pre-increment or pre-decrement
operator -- and ++, which doesn't exist in Python.

## duplicate-argument-name

#### E0108 - Duplicate argument name %s in function definition

Duplicate argument names in function definitions are syntax errors.

## abstract-class-instantiated

#### E0110 - Abstract class %r with abstract methods instantiated

Used when an abstract class with `abc.ABCMeta` as metaclass has abstract
methods and is instantiated.

## bad-reversed-sequence

#### E0111 - The first reversed() argument is not a sequence

Used when the first argument to reversed() builtin isn't a sequence
(does not implement **reversed**, nor **getitem** and **len**

## too-many-star-expressions

#### E0112 - More than one starred expression in assignment

Emitted when there are more than one starred expressions (`*x`) in an
assignment. This is a SyntaxError.

## invalid-star-assignment-target

#### E0113 - Starred assignment target must be in a list or tuple

Emitted when a star expression is used as a starred assignment target.

## star-needs-assignment-target

#### E0114 - Can use starred expression only in assignment target

Emitted when a star expression is not used in an assignment target.

## nonlocal-and-global

#### E0115 - Name %r is nonlocal and global

Emitted when a name is both nonlocal and global.

## continue-in-finally

#### E0116 - 'continue' not supported inside 'finally' clause

Emitted when the `continue` keyword is found inside a finally clause,
which is a SyntaxError.

## nonlocal-without-binding

#### E0117 - nonlocal name %s found without binding

Emitted when a nonlocal variable does not have an attached name
somewhere in the parent scopes

## used-prior-global-declaration

#### E0118 - Name %r is used prior to global declaration

Emitted when a name is used prior a global declaration, which results in
an error since Python 3.6. This message can't be emitted when using
Python \< 3.6.

## misplaced-format-function

#### E0119 - format function is not called on str

Emitted when format function is not called on str object. e.g doing
print("value: {}").format(123) instead of print("value:
{}".format(123)). This might not be what the user intended to do.

## method-hidden

#### E0202 - An attribute defined in %s line %s hides this method

Used when a class defines a method which is hidden by an instance
attribute from an ancestor class or set by some client code.

## access-member-before-definition

#### E0203 - Access to member %r before its definition line %s

Used when an instance member is accessed before it's actually assigned.

## no-method-argument

#### E0211 - Method has no argument

Used when a method which should have the bound instance as first
argument has no argument defined.

## no-self-argument

#### E0213 - Method should have "self" as first argument

Used when a method has an attribute different the "self" as first
argument. This is considered as an error since this is a so common
convention that you shouldn't break
it\!

## invalid-slots-object

#### E0236 - Invalid object %r in **slots**, must contain only non empty strings

Used when an invalid (non-string) object occurs in **slots**.

## assigning-non-slot

#### E0237 - Assigning to attribute %r not defined in class slots

Used when assigning to an attribute not defined in the class slots.

## invalid-slots

#### E0238 - Invalid **slots** object

Used when an invalid **slots** is found in class. Only a string, an
iterable or a sequence is permitted.

## inherit-non-class

#### E0239 - Inheriting %r, which is not a class.

Used when a class inherits from something which is not a class.

## inconsistent-mro

#### E0240 - Inconsistent method resolution order for class %r

Used when a class has an inconsistent method resolution order.

## duplicate-bases

#### E0241 - Duplicate bases for class %r

Used when a class has duplicate bases.

## non-iterator-returned

#### E0301 - **iter** returns non-iterator

Used when an **iter** method returns something which is not an iterable
(i.e. has no `__next__` method)

## unexpected-special-method-signature

#### E0302 - The special method %r expects %s param(s), %d %s given

Emitted when a special method was defined with an invalid number of
parameters. If it has too few or too many, it might not work at all.

## invalid-length-returned

#### E0303 - **len** does not return non-negative integer

Used when a **len** method returns something which is not a non-negative
integer

## import-error

#### E0401 - Unable to import %s

Used when pylint has been unable to import a module.

## relative-beyond-top-level

#### E0402 - Attempted relative import beyond top-level package

Used when a relative import tries to access too many levels in the
current package.

## used-before-assignment

#### E0601 - Using variable %r before assignment

Used when a local variable is accessed before its assignment.

## undefined-variable

#### E0602 - Undefined variable %r

Used when an undefined variable is accessed.

## undefined-all-variable

#### E0603 - Undefined variable name %r in **all**

Used when an undefined variable name is referenced in **all**.

## invalid-all-object

#### E0604 - Invalid object %r in **all**, must contain only strings

Used when an invalid (non-string) object occurs in **all**.

## no-name-in-module

#### E0611 - No name %r in module %r

Used when a name cannot be found in a module.

## unpacking-non-sequence

#### E0633 - Attempting to unpack a non-sequence%s

Used when something which is not a sequence is used in an unpack
assignment

## bad-except-order

#### E0701 - Bad except clauses order (%s)

Used when except clauses are not in the correct order (from the more
specific to the more generic). If you don't fix the order, some
exceptions may not be caught by the most specific handler.

## raising-bad-type

#### E0702 - Raising %s while only classes or instances are allowed

Used when something which is neither a class, an instance or a string is
raised (i.e. a `TypeError` will be
raised).

## bad-exception-context

#### E0703 - Exception context set to something which is not an exception, nor None

Used when using the syntax "raise ... from ...", where the exception
context is not an exception, nor None.

## misplaced-bare-raise

#### E0704 - The raise statement is not inside an except clause

Used when a bare raise is not used inside an except clause. This
generates an error, since there are no active exceptions to be reraised.
An exception to this rule is represented by a bare raise inside a
finally clause, which might work, as long as an exception is raised
inside the try block, but it is nevertheless a code smell that must not
be relied
upon.

## raising-non-exception

#### E0710 - Raising a new style class which doesn't inherit from BaseException

Used when a new style class which doesn't inherit from BaseException is
raised.

## notimplemented-raised

#### E0711 - NotImplemented raised - should raise NotImplementedError

Used when NotImplemented is raised instead of
NotImplementedError

## catching-non-exception

#### E0712 - Catching an exception which doesn't inherit from Exception: %s

Used when a class which doesn't inherit from Exception is used as an
exception in an except clause.

## bad-super-call

#### E1003 - Bad first argument %r given to super()

Used when another argument than the current class is given as first
argument of the super builtin.

## no-member

#### E1101 - %s %r has no %r member%s

Used when a variable is accessed for an unexistent member.

## not-callable

#### E1102 - %s is not callable

Used when an object being called has been inferred to a non callable
object.

## assignment-from-no-return

#### E1111 - Assigning result of a function call, where the function has no return

Used when an assignment is done on a function call but the inferred
function doesn't return anything.

## no-value-for-parameter

#### E1120 - No value for argument %s in %s call

Used when a function call passes too few arguments.

## too-many-function-args

#### E1121 - Too many positional arguments for %s call

Used when a function call passes too many positional arguments.

## unexpected-keyword-arg

#### E1123 - Unexpected keyword argument %r in %s call

Used when a function call passes a keyword argument that doesn't
correspond to one of the function's parameter names.

## redundant-keyword-arg

#### E1124 - Argument %r passed by position and keyword in %s call

Used when a function call would result in assigning multiple values to a
function parameter, one value from a positional argument and one from a
keyword argument.

## missing-kwoa

#### E1125 - Missing mandatory keyword argument %r in %s call

Used when a function call does not pass a mandatory keyword-only
argument.

## invalid-sequence-index

#### E1126 - Sequence index is not an int, slice, or instance with **index**

Used when a sequence type is indexed with an invalid type. Valid types
are ints, slices, and objects with an **index** method.

## invalid-slice-index

#### E1127 - Slice index is not an int, None, or instance with **index**

Used when a slice index is not an integer, None, or an object with an
**index**
method.

## assignment-from-none

#### E1128 - Assigning result of a function call, where the function returns None

Used when an assignment is done on a function call but the inferred
function returns nothing but
None.

## not-context-manager

#### E1129 - Context manager '%s' doesn't implement **enter** and **exit**.

Used when an instance in a with statement doesn't implement the context
manager protocol(**enter**/**exit**).

## invalid-unary-operand-type

#### E1130 -

Emitted when a unary operand is used on an object which does not support
this type of operation.

## unsupported-binary-operation

#### E1131 -

Emitted when a binary arithmetic operation between two operands is not
supported.

## repeated-keyword

#### E1132 - Got multiple values for keyword argument %r in function call

Emitted when a function call got multiple values for a keyword.

## not-an-iterable

#### E1133 - Non-iterable value %s is used in an iterating context

Used when a non-iterable value is used in place where iterable is
expected

## not-a-mapping

#### E1134 - Non-mapping value %s is used in a mapping context

Used when a non-mapping value is used in place where mapping is expected

## unsupported-membership-test

#### E1135 - Value '%s' doesn't support membership test

Emitted when an instance in membership test expression doesn't implement
membership protocol (**contains**/**iter**/**getitem**).

## unsubscriptable-object

#### E1136 - Value '%s' is unsubscriptable

Emitted when a subscripted value doesn't support subscription (i.e.
doesn't define **getitem** method).

## unsupported-assignment-operation

#### E1137 - %r does not support item assignment

Emitted when an object does not support item assignment (i.e. doesn't
define **setitem** method).

## unsupported-delete-operation

#### E1138 - %r does not support item deletion

Emitted when an object does not support item deletion (i.e. doesn't
define **delitem** method).

## invalid-metaclass

#### E1139 - Invalid metaclass %r used

Emitted whenever we can detect that a class is using, as a metaclass,
something which might be invalid for using as a metaclass.

## unhashable-dict-key

#### E1140 - Dict key is unhashable

Emitted when a dict key is not hashable (i.e. doesn't define **hash**
method).

## logging-unsupported-format

#### E1200 - Unsupported logging format character %r (%\#02x) at index %d

Used when an unsupported format character is used in a logging statement
format
string.

## logging-format-truncated

#### E1201 - Logging format string ends in middle of conversion specifier

Used when a logging statement format string terminates before the end of
a conversion specifier.

## logging-too-many-args

#### E1205 - Too many arguments for logging format string

Used when a logging format string is given too many arguments.

## logging-too-few-args

#### E1206 - Not enough arguments for logging format string

Used when a logging format string is given too few arguments.

## bad-format-character

#### E1300 - Unsupported format character %r (%\#02x) at index %d

Used when an unsupported format character is used in a format string.

## truncated-format-string

#### E1301 - Format string ends in middle of conversion specifier

Used when a format string terminates before the end of a conversion
specifier.

## mixed-format-string

#### E1302 - Mixing named and unnamed conversion specifiers in format string

Used when a format string contains both named (e.g. '%(foo)d') and
unnamed (e.g. '%d') conversion specifiers. This is also used when a
named conversion specifier contains \* for the minimum field width
and/or precision.

## format-needs-mapping

#### E1303 - Expected mapping for format string, not %s

Used when a format string that uses named conversion specifiers is used
with an argument that is not a mapping.

## missing-format-string-key

#### E1304 - Missing key %r in format string dictionary

Used when a format string that uses named conversion specifiers is used
with a dictionary that doesn't contain all the keys required by the
format string.

## too-many-format-args

#### E1305 - Too many arguments for format string

Used when a format string that uses unnamed conversion specifiers is
given too many arguments.

## too-few-format-args

#### E1306 - Not enough arguments for format string

Used when a format string that uses unnamed conversion specifiers is
given too few arguments

## bad-string-format-type

#### E1307 - Argument %r does not match format type %r

Used when a type required by format string is not suitable for actual
argument type

## bad-str-strip-call

#### E1310 - Suspicious argument in %s.%s call

The argument to a str.{l,r,}strip call contains a duplicate character,

## invalid-envvar-value

#### E1507 - %s does not support %s type argument

Env manipulation functions support only string type arguments. See
<https://docs.python.org/3/library/os.html#os.getenv>.

## print-statement

#### E1601 - print statement used

Used when a print statement is used (`print` is a function in Python 3)

## parameter-unpacking

#### E1602 - Parameter unpacking specified

Used when parameter unpacking is specified for a function(Python 3
doesn't allow
it)

## unpacking-in-except

#### E1603 - Implicit unpacking of exceptions is not supported in Python 3

Python3 will not allow implicit unpacking of exceptions in except
clauses. See
<http://www.python.org/dev/peps/pep-3110/>

## old-raise-syntax

#### E1604 - Use raise ErrorClass(args) instead of raise ErrorClass, args.

Used when the alternate raise syntax 'raise foo, bar' is used instead of
'raise foo(bar)'.

## backtick

#### E1605 - Use of the \`\` operator

Used when the deprecated "\`\`" (backtick) operator is used instead of
the str() function.

## yield-inside-async-function

#### E1700 - Yield inside async function

Used when an `yield` or `yield from` statement is found inside an async
function. This message can't be emitted when using Python \<
3.5.

## not-async-context-manager

#### E1701 - Async context manager '%s' doesn't implement **aenter** and **aexit**.

Used when an async context manager is used with an object that does not
implement the async context management protocol. This message can't be
emitted when using Python \< 3.5.

## fatal

#### F0001 -

Used when an error occurred preventing the analysis of a module (unable
to find it for instance).

## astroid-error

#### F0002 - %s: %s

Used when an unexpected error occurred while building the Astroid
representation. This is usually accompanied by a traceback. Please
report such errors \!

## parse-error

#### F0010 - error while code parsing: %s

Used when an exception occurred while building the Astroid
representation which could be handled by astroid.

## method-check-failed

#### F0202 - Unable to check methods signature (%s / %s)

Used when Pylint has been unable to check methods signature
compatibility for an unexpected reason. Please report this kind if you
don't make sense of it.

## raw-checker-failed

#### I0001 - Unable to run raw checkers on built-in module %s

Used to inform that a built-in module has not been checked using the raw
checkers.

## bad-inline-option

#### I0010 - Unable to consider inline option %r

Used when an inline option is either badly formatted or can't be used
inside modules.

## locally-disabled

#### I0011 - Locally disabling %s (%s)

Used when an inline option disables a message or a messages category.

## file-ignored

#### I0013 - Ignoring entire file

Used to inform that the file will not be checked

## suppressed-message

#### I0020 - Suppressed %s (from line %d)

A message was triggered on a line, but suppressed explicitly by a
disable= comment in the file. This message is not generated for messages
that are ignored due to configuration settings.

## useless-suppression

#### I0021 - Useless suppression of %s

Reported when a message is explicitly disabled for a line or a block of
code, but never triggered.

## deprecated-pragma

#### I0022 - Pragma "%s" is deprecated, use "%s" instead

Some inline pylint options have been renamed or reworked, only the most
recent form should be used. NOTE:skip-all is only available with pylint
\>= 0.26

## use-symbolic-message-instead

#### I0023 -

Used when a message is enabled or disabled by
id.

## c-extension-no-member

#### I1101 - %s %r has no %r member%s, but source is unavailable. Consider adding this module to extension-pkg-whitelist if you want to perform analysis based on run-time introspection of living objects.

Used when a variable is accessed for non-existent member of C extension.
Due to unavailability of source static analysis is impossible, but it
may be performed by introspecting living objects in run-time.

## literal-comparison

#### R0123 - Comparison to literal

Used when comparing an object to a literal, which is usually what you do
not want to do, since you can compare to a different literal than what
was expected altogether.

## comparison-with-itself

#### R0124 - Redundant comparison - %s

Used when something is compared against itself.

## no-self-use

#### R0201 - Method could be a function

Used when a method doesn't use its bound instance, and so could be
written as a function.

## no-classmethod-decorator

#### R0202 - Consider using a decorator instead of calling classmethod

Used when a class method is defined without using the decorator syntax.

## no-staticmethod-decorator

#### R0203 - Consider using a decorator instead of calling staticmethod

Used when a static method is defined without using the decorator
syntax.

## useless-object-inheritance

#### R0205 - Class %r inherits from object, can be safely removed from bases in python3

Used when a class inherit from object, which under python3 is implicit,
hence can be safely removed from bases.

## cyclic-import

#### R0401 - Cyclic import (%s)

Used when a cyclic import between two or more modules is detected.

## duplicate-code

#### R0801 - Similar lines in %s files

Indicates that a set of similar lines has been detected among multiple
file. This usually means that the code should be refactored to avoid
this duplication.

## too-many-ancestors

#### R0901 - Too many ancestors (%s/%s)

Used when class has too many parent classes, try to reduce this to get a
simpler (and so easier to use) class.

## too-many-instance-attributes

#### R0902 - Too many instance attributes (%s/%s)

Used when class has too many instance attributes, try to reduce this to
get a simpler (and so easier to use) class.

## too-few-public-methods

#### R0903 - Too few public methods (%s/%s)

Used when class has too few public methods, so be sure it's really worth
it.

## too-many-public-methods

#### R0904 - Too many public methods (%s/%s)

Used when class has too many public methods, try to reduce this to get a
simpler (and so easier to use) class.

## too-many-return-statements

#### R0911 - Too many return statements (%s/%s)

Used when a function or method has too many return statement, making it
hard to follow.

## too-many-branches

#### R0912 - Too many branches (%s/%s)

Used when a function or method has too many branches, making it hard to
follow.

## too-many-arguments

#### R0913 - Too many arguments (%s/%s)

Used when a function or method takes too many arguments.

## too-many-locals

#### R0914 - Too many local variables (%s/%s)

Used when a function or method has too many local variables.

## too-many-statements

#### R0915 - Too many statements (%s/%s)

Used when a function or method has too many statements. You should then
split it in smaller functions / methods.

## too-many-boolean-expressions

#### R0916 - Too many boolean expressions in if statement (%s/%s)

Used when an if statement contains too many boolean
expressions.

## consider-merging-isinstance

#### R1701 - Consider merging these isinstance calls to isinstance(%s, (%s))

Used when multiple consecutive isinstance calls can be merged into one.

## too-many-nested-blocks

#### R1702 - Too many nested blocks (%s/%s)

Used when a function or a method has too many nested blocks. This makes
the code less understandable and maintainable.

## simplifiable-if-statement

#### R1703 - The if statement can be replaced with %s

Used when an if statement can be replaced with 'bool(test)'.

## redefined-argument-from-local

#### R1704 - Redefining argument with the local name %r

Used when a local name is redefining an argument, which might suggest a
potential error. This is taken in account only for a handful of name
binding operations, such as for iteration, with statement assignment and
exception handler assignment.

## no-else-return

#### R1705 - Unnecessary "%s" after "return"

Used in order to highlight an unnecessary block of code following an if
containing a return statement. As such, it will warn when it encounters
an else following a chain of ifs, all of them containing a return
statement.

## consider-using-ternary

#### R1706 - Consider using ternary (%s)

Used when one of known pre-python 2.5 ternary syntax is used.

## trailing-comma-tuple

#### R1707 - Disallow trailing comma tuple

In Python, a tuple is actually created by the comma symbol, not by the
parentheses. Unfortunately, one can actually create a tuple by
misplacing a trailing comma, which can lead to potential weird bugs in
your code. You should always use parentheses explicitly for creating a
tuple.

## stop-iteration-return

#### R1708 - Do not raise StopIteration in generator, use return statement instead

According to PEP479, the raise of StopIteration to end the loop of a
generator may lead to hard to find bugs. This PEP specify that raise
StopIteration has to be replaced by a simple return statement

## simplify-boolean-expression

#### R1709 - Boolean expression may be simplified to %s

Emitted when redundant pre-python 2.5 ternary syntax is
used.

## inconsistent-return-statements

#### R1710 - Either all return statements in a function should return an expression, or none of them should.

According to PEP8, if any return statement returns an expression, any
return statements where no value is returned should explicitly state
this as return None, and an explicit return statement should be present
at the end of the function (if reachable)

## useless-return

#### R1711 - Useless return at end of function or method

Emitted when a single "return" or "return None" statement is found at
the end of function or method definition. This statement can safely be
removed because Python will implicitly return None

## consider-swap-variables

#### R1712 - Consider using tuple unpacking for swapping variables

You do not have to use a temporary variable in order to swap variables.
Using "tuple unpacking" to directly swap variables makes the intention
more
clear.

## consider-using-join

#### R1713 - Consider using str.join(sequence) for concatenating strings from an iterable

Using str.join(sequence) is faster, uses less memory and increases
readability compared to for-loop iteration.

## consider-using-in

#### R1714 - Consider merging these comparisons with "in" to %r

To check if a variable is equal to one of many values,combine the values
into a tuple and check if the variable is contained "in" it instead of
checking for equality against each of the values.This is faster and less
verbose.

## consider-using-get

#### R1715 - Consider using dict.get for getting values from a dict if a key is present or a default if not

Using the builtin dict.get for getting a value from a dictionary if a
key is present or a default if not, is simpler and considered more
idiomatic, although sometimes a bit slower

## chained-comparison

#### R1716 - Simplify chained comparison between the operands

This message is emitted when pylint encounters boolean operation like"a
\< b and b \< c", suggesting instead to refactor it to "a \< b \< c"

## consider-using-dict-comprehension

#### R1717 - Consider using a dictionary comprehension

Although there is nothing syntactically wrong with this code, it is hard
to read and can be simplified to a dict comprehension.Also it is faster
since you don't need to create another transient list

## consider-using-set-comprehension

#### R1718 - Consider using a set comprehension

Although there is nothing syntactically wrong with this code, it is hard
to read and can be simplified to a set comprehension.Also it is faster
since you don't need to create another transient list

## simplifiable-if-expression

#### R1719 - The if expression can be replaced with %s

Used when an if expression can be replaced with 'bool(test)'.

## unreachable

#### W0101 - Unreachable code

Used when there is some code behind a "return" or "raise" statement,
which will never be accessed.

## dangerous-default-value

#### W0102 - Dangerous default value %s as argument

Used when a mutable value as list or dictionary is detected in a default
value for an argument.

## pointless-statement

#### W0104 - Statement seems to have no effect

Used when a statement doesn't have (or at least seems to) any effect.

## pointless-string-statement

#### W0105 - String statement has no effect

Used when a string is used as a statement (which of course has no
effect). This is a particular case of W0104 with its own message so you
can easily disable it if you're using those strings as documentation,
instead of comments.

## expression-not-assigned

#### W0106 - Expression "%s" is assigned to nothing

Used when an expression that is not a function call is assigned to
nothing. Probably something else was intended.

## unnecessary-pass

#### W0107 - Unnecessary pass statement

Used when a "pass" statement that can be avoided is encountered.

## unnecessary-lambda

#### W0108 - Lambda may not be necessary

Used when the body of a lambda expression is a function call on the same
argument list as the lambda itself; such lambda expressions are in all
but a few cases replaceable with the function being called in the body
of the lambda.

## duplicate-key

#### W0109 - Duplicate key %r in dictionary

Used when a dictionary expression binds the same key multiple times.

## assign-to-new-keyword

#### W0111 - Name %s will become a keyword in Python %s

Used when assignment will become invalid in future Python release due to
introducing new keyword.

## useless-else-on-loop

#### W0120 - Else clause on loop without a break statement

Loops should only have an else clause if they can exit early with a
break statement, otherwise the statements under else should be on the
same scope as the loop itself.

## exec-used

#### W0122 - Use of exec

Used when you use the "exec" statement (function for Python 3), to
discourage its usage. That doesn't mean you cannot use it \!

## eval-used

#### W0123 - Use of eval

Used when you use the "eval" function, to discourage its usage. Consider
using `ast.literal_eval` for safely evaluating strings containing Python
expressions from untrusted
sources.

## confusing-with-statement

#### W0124 - Following "as" with another context manager looks like a tuple.

Emitted when a `with` statement component returns multiple values and
uses name binding with `as` only for a part of those values, as in with
ctx() as a, b. This can be misleading, since it's not clear if the
context manager returns a tuple or if the node without a name binding is
another context manager.

## using-constant-test

#### W0125 - Using a conditional statement with a constant value

Emitted when a conditional statement (If or ternary if) uses a constant
value for its test. This might not be what the user intended to do.

## comparison-with-callable

#### W0143 - Comparing against a callable, did you omit the parenthesis?

This message is emitted when pylint detects that a comparison with a
callable was made, which might suggest that some parenthesis were
omitted, resulting in potential unwanted behaviour.

## lost-exception

#### W0150 - %s statement in finally block may swallow exception

Used when a break or a return statement is found inside the finally
clause of a try...finally block: the exceptions raised in the try clause
will be silently swallowed instead of being re-raised.

## assert-on-tuple

#### W0199 - Assert called on a 2-uple. Did you mean 'assert x,y'?

A call of assert on a tuple will always evaluate to true if the tuple is
not empty, and will always evaluate to false if it is.

## attribute-defined-outside-init

#### W0201 - Attribute %r defined outside **init**

Used when an instance attribute is defined outside the **init** method.

## bad-staticmethod-argument

#### W0211 - Static method with %r as first argument

Used when a static method has "self" or a value specified in valid-
classmethod-first-arg option or valid-metaclass-classmethod-first-arg
option as first argument.

## protected-access

#### W0212 - Access to a protected member %s of a client class

Used when a protected member (i.e. class member with a name beginning
with an underscore) is access outside the class or a descendant of the
class where it's defined.

## arguments-differ

#### W0221 - Parameters differ from %s %r method

Used when a method has a different number of arguments than in the
implemented interface or in an overridden method.

## signature-differs

#### W0222 - Signature differs from %s %r method

Used when a method signature is different than in the implemented
interface or in an overridden method.

## abstract-method

#### W0223 - Method %r is abstract in class %r but is not overridden

Used when an abstract method (i.e. raise NotImplementedError) is not
overridden in concrete class.

## super-init-not-called

#### W0231 - **init** method from base class %r is not called

Used when an ancestor class method has an **init** method which is not
called by a derived class.

## no-init

#### W0232 - Class has no **init** method

Used when a class has no **init** method, neither its parent classes.

## non-parent-init-called

#### W0233 - **init** method from a non direct base class %r is called

Used when an **init** method is called on a class which is not in the
direct ancestors for the analysed class.

## useless-super-delegation

#### W0235 - Useless super delegation in method %r

Used whenever we can detect that an overridden method is useless,
relying on super() delegation to do the same thing as another method
from the MRO.

## unnecessary-semicolon

#### W0301 - Unnecessary semicolon

Used when a statement is ended by a semi-colon (";"), which isn't
necessary (that's python, not C ;).

## bad-indentation

#### W0311 - Bad indentation. Found %s %s, expected %s

Used when an unexpected number of indentation's tabulations or spaces
has been found.

## mixed-indentation

#### W0312 - Found indentation with %ss instead of %ss

Used when there are some mixed tabs and spaces in a module.

## wildcard-import

#### W0401 - Wildcard import %s

Used when `from module import *` is detected.

## deprecated-module

#### W0402 - Uses of a deprecated module %r

Used a module marked as deprecated is imported.

## reimported

#### W0404 - Reimport %r (imported line %s)

Used when a module is reimported multiple times.

## import-self

#### W0406 - Module import itself

Used when a module is importing itself.

## misplaced-future

#### W0410 - **future** import is not the first non docstring statement

Python 2.5 and greater require **future** import to be the first non
docstring statement in the module.

## fixme

#### W0511 -

Used when a warning note as FIXME or XXX is detected.

## global-variable-undefined

#### W0601 - Global variable %r undefined at the module level

Used when a variable is defined through the "global" statement but the
variable is not defined in the module scope.

## global-variable-not-assigned

#### W0602 - Using global for %r but no assignment is done

Used when a variable is defined through the "global" statement but no
assignment to this variable is done.

## global-statement

#### W0603 - Using the global statement

Used when you use the "global" statement to update a global variable.
Pylint just try to discourage this usage. That doesn't mean you cannot
use it \!

## global-at-module-level

#### W0604 - Using the global statement at the module level

Used when you use the "global" statement at the module level since it
has no effect

## unused-import

#### W0611 - Unused %s

Used when an imported module or variable is not used.

## unused-variable

#### W0612 - Unused variable %r

Used when a variable is defined but not used.

## unused-argument

#### W0613 - Unused argument %r

Used when a function or method argument is not used.

## unused-wildcard-import

#### W0614 - Unused import %s from wildcard import

Used when an imported module or variable is not used from a `'from X
import *'` style import.

## redefined-outer-name

#### W0621 - Redefining name %r from outer scope (line %s)

Used when a variable's name hides a name defined in the outer scope.

## redefined-builtin

#### W0622 - Redefining built-in %r

Used when a variable or function override a built-in.

## redefine-in-handler

#### W0623 - Redefining name %r from %s in exception handler

Used when an exception handler assigns the exception to an existing name

## undefined-loop-variable

#### W0631 - Using possibly undefined loop variable %r

Used when a loop variable (i.e. defined by a for loop or a list
comprehension or a generator expression) is used outside the
loop.

## unbalanced-tuple-unpacking

#### W0632 - Possible unbalanced tuple unpacking with sequence%s: left side has %d label(s), right side has %d value(s)

Used when there is an unbalanced tuple unpacking in assignment

## cell-var-from-loop

#### W0640 - Cell variable %s defined in loop

A variable used in a closure is defined in a loop. This will result in
all closures using the same value for the closed-over variable.

## possibly-unused-variable

#### W0641 - Possibly unused variable %r

Used when a variable is defined but might not be used. The possibility
comes from the fact that locals() might be used, which could consume or
not the said variable

## self-cls-assignment

#### W0642 - Invalid assignment to %s in method

Invalid assignment to self or cls in instance or class method
respectively.

## bare-except

#### W0702 - No exception type(s) specified

Used when an except clause doesn't specify exceptions type to catch.

## broad-except

#### W0703 - Catching too general exception %s

Used when an except catches a too general exception, possibly burying
unrelated errors.

## duplicate-except

#### W0705 - Catching previously caught exception type %s

Used when an except catches a type that was already caught by a previous
handler.

## try-except-raise

#### W0706 - The except handler raises immediately

Used when an except handler uses raise as its first or only operator.
This is useless because it raises back the exception immediately. Remove
the raise operator or the entire try-except-raise block\!

## binary-op-exception

#### W0711 - Exception to catch is the result of a binary "%s" operation

Used when the exception to catch is of the form "except A or B:". If
intending to catch multiple, rewrite as "except (A,
B):"

## raising-format-tuple

#### W0715 - Exception arguments suggest string formatting might be intended

Used when passing multiple arguments to an exception constructor, the
first of them a string literal containing what appears to be
placeholders intended for
formatting

## keyword-arg-before-vararg

#### W1113 - Keyword argument before variable positional arguments list in the definition of %s function

When defining a keyword argument before variable positional arguments,
one can end up in having multiple values passed for the aforementioned
parameter in case the method is called with keyword
arguments.

## logging-not-lazy

#### W1201 - Specify string format arguments as logging function parameters

Used when a logging statement has a call form of
"logging.<logging method>(format\_string % (format\_args...))". Such
calls should leave string interpolation to the logging method itself and
be written "logging.<logging method>(format\_string, format\_args...)"
so that the program may avoid incurring the cost of the interpolation in
those cases in which no message will be logged. For more, see
<http://www.python.org/dev/peps/pep-0282/>.

## logging-format-interpolation

#### W1202 - Use % formatting in logging functions and pass the % parameters as arguments

Used when a logging statement has a call form of
"logging.<logging method>(format\_string.format(format\_args...))". Such
calls should use % formatting instead, but leave interpolation to the
logging function by passing the parameters as
arguments.

## logging-fstring-interpolation

#### W1203 - Use % formatting in logging functions and pass the % parameters as arguments

Used when a logging statement has a call form of
"logging.method(f"..."))". Such calls should use % formatting instead,
but leave interpolation to the logging function by passing the
parameters as arguments.

## bad-format-string-key

#### W1300 - Format string dictionary key should be a string, not %s

Used when a format string that uses named conversion specifiers is used
with a dictionary whose keys are not all strings.

## unused-format-string-key

#### W1301 - Unused key %r in format string dictionary

Used when a format string that uses named conversion specifiers is used
with a dictionary that contains keys not required by the format string.

## bad-format-string

#### W1302 - Invalid format string

Used when a PEP 3101 format string is invalid.

## missing-format-argument-key

#### W1303 - Missing keyword argument %r for format string

Used when a PEP 3101 format string that uses named fields doesn't
receive one or more required keywords.

## unused-format-string-argument

#### W1304 - Unused format argument %r

Used when a PEP 3101 format string that uses named fields is used with
an argument that is not required by the format
string.

## format-combined-specification

#### W1305 - Format string contains both automatic field numbering and manual field specification

Used when a PEP 3101 format string contains both automatic field
numbering (e.g. '{}') and manual field specification (e.g. '{0}').

## missing-format-attribute

#### W1306 - Missing format attribute %r in format specifier %r

Used when a PEP 3101 format string uses an attribute specifier
({0.length}), but the argument passed for formatting doesn't have that
attribute.

## invalid-format-index

#### W1307 - Using invalid lookup key %r in format specifier %r

Used when a PEP 3101 format string uses a lookup specifier ({a\[1\]}),
but the argument passed for formatting doesn't contain or doesn't have
that key as an
attribute.

## duplicate-string-formatting-argument

#### W1308 - Duplicate string formatting argument %r, consider passing as named argument

Used when we detect that a string formatting is repeating an argument
instead of using named string
arguments

## anomalous-backslash-in-string

#### W1401 - Anomalous backslash in string: '%s'. String constant might be missing an r prefix.

Used when a backslash is in a literal string but not as an
escape.

## anomalous-unicode-escape-in-string

#### W1402 - Anomalous Unicode escape in byte string: '%s'. String constant might be missing an r or u prefix.

Used when an escape like \\u is encountered in a byte string where it
has no effect.

## implicit-str-concat-in-sequence

#### W1403 - Implicit string concatenation found in %s

String literals are implicitly concatenated in a literal iterable
definition : maybe a comma is missing ?

## bad-open-mode

#### W1501 - "%s" is not a valid mode for open.

Python supports: r, w, a\[, x\] modes with b, +, and U (only with r)
options. See <http://docs.python.org/2/library/functions.html#open>

## redundant-unittest-assert

#### W1503 - Redundant use of %s with constant value %r

The first argument of assertTrue and assertFalse is a condition. If a
constant is passed as parameter, that condition will be always true. In
this case a warning should be emitted.

## deprecated-method

#### W1505 - Using deprecated method %s()

The method is marked as deprecated and will be removed in a future
version of Python. Consider looking for an alternative in the
documentation.

## bad-thread-instantiation

#### W1506 - threading.Thread needs the target function

The warning is emitted when a threading.Thread class is instantiated
without the target function being passed. By default, the first
parameter is the group param, not the target param.

## shallow-copy-environ

#### W1507 - Using copy.copy(os.environ). Use os.environ.copy() instead.

os.environ is not a dict object but proxy object, so shallow copy has
still effects on original object. See
<https://bugs.python.org/issue15373> for reference.

## invalid-envvar-default

#### W1508 - %s default type is %s. Expected str or None.

Env manipulation functions return None or str values. Supplying anything
different as a default may cause bugs. See
<https://docs.python.org/3/library/os.html#os.getenv>.

## subprocess-popen-preexec-fn

#### W1509 - Using preexec\_fn keyword which may be unsafe in the presence of threads

The preexec\_fn parameter is not safe to use in the presence of threads
in your application. The child process could deadlock before exec is
called. If you must use it, keep it trivial\! Minimize the number of
libraries you call
into.<https://docs.python.org/3/library/subprocess.html#popen-constructor>

## apply-builtin

#### W1601 - apply built-in referenced

Used when the apply built-in function is referenced (missing from Python
3)

## basestring-builtin

#### W1602 - basestring built-in referenced

Used when the basestring built-in function is referenced (missing from
Python 3)

## buffer-builtin

#### W1603 - buffer built-in referenced

Used when the buffer built-in function is referenced (missing from
Python 3)

## cmp-builtin

#### W1604 - cmp built-in referenced

Used when the cmp built-in function is referenced (missing from Python
3)

## coerce-builtin

#### W1605 - coerce built-in referenced

Used when the coerce built-in function is referenced (missing from
Python 3)

## execfile-builtin

#### W1606 - execfile built-in referenced

Used when the execfile built-in function is referenced (missing from
Python 3)

## file-builtin

#### W1607 - file built-in referenced

Used when the file built-in function is referenced (missing from Python
3)

## long-builtin

#### W1608 - long built-in referenced

Used when the long built-in function is referenced (missing from Python
3)

## raw\_input-builtin

#### W1609 - raw\_input built-in referenced

Used when the raw\_input built-in function is referenced (missing from
Python 3)

## reduce-builtin

#### W1610 - reduce built-in referenced

Used when the reduce built-in function is referenced (missing from
Python 3)

## standarderror-builtin

#### W1611 - StandardError built-in referenced

Used when the StandardError built-in function is referenced (missing
from Python 3)

## unicode-builtin

#### W1612 - unicode built-in referenced

Used when the unicode built-in function is referenced (missing from
Python 3)

## xrange-builtin

#### W1613 - xrange built-in referenced

Used when the xrange built-in function is referenced (missing from
Python 3)

## coerce-method

#### W1614 - **coerce** method defined

Used when a **coerce** method is defined (method is not used by Python
3)

## delslice-method

#### W1615 - **delslice** method defined

Used when a **delslice** method is defined (method is not used by Python
3)

## getslice-method

#### W1616 - **getslice** method defined

Used when a **getslice** method is defined (method is not used by Python
3)

## setslice-method

#### W1617 - **setslice** method defined

Used when a **setslice** method is defined (method is not used by Python
3)

## no-absolute-import

#### W1618 - import missing `from __future__ import absolute_import`

Used when an import is not accompanied by `from __future__ import
absolute_import` (default behaviour in Python 3)

## old-division

#### W1619 - division w/o **future** statement

Used for non-floor division w/o a float literal or `from __future__
import division` (Python 3 returns a float for int division
unconditionally)

## dict-iter-method

#### W1620 - Calling a dict.iter\*() method

Used for calls to dict.iterkeys(), itervalues() or iteritems() (Python 3
lacks these methods)

## dict-view-method

#### W1621 - Calling a dict.view\*() method

Used for calls to dict.viewkeys(), viewvalues() or viewitems() (Python 3
lacks these methods)

## next-method-called

#### W1622 - Called a next() method on an object

Used when an object's next() method is called (Python 3 uses the next()
built- in function)

## metaclass-assignment

#### W1623 - Assigning to a class's **metaclass** attribute

Used when a metaclass is specified by assigning to **metaclass** (Python
3 specifies the metaclass as a class statement argument)

## indexing-exception

#### W1624 - Indexing exceptions will not work on Python 3

Indexing exceptions will not work on Python 3. Use
`exception.args[index]` instead.

## raising-string

#### W1625 - Raising a string exception

Used when a string exception is raised. This will not work on Python 3.

## reload-builtin

#### W1626 - reload built-in referenced

Used when the reload built-in function is referenced (missing from
Python 3). You can use instead imp.reload or importlib.reload.

## oct-method

#### W1627 - **oct** method defined

Used when an **oct** method is defined (method is not used by Python 3)

## hex-method

#### W1628 - **hex** method defined

Used when a **hex** method is defined (method is not used by Python 3)

## nonzero-method

#### W1629 - **nonzero** method defined

Used when a **nonzero** method is defined (method is not used by Python
3)

## cmp-method

#### W1630 - **cmp** method defined

Used when a **cmp** method is defined (method is not used by Python 3)

## input-builtin

#### W1632 - input built-in referenced

Used when the input built-in is referenced (backwards-incompatible
semantics in Python 3)

## round-builtin

#### W1633 - round built-in referenced

Used when the round built-in is referenced (backwards-incompatible
semantics in Python 3)

## intern-builtin

#### W1634 - intern built-in referenced

Used when the intern built-in is referenced (Moved to sys.intern in
Python 3)

## unichr-builtin

#### W1635 - unichr built-in referenced

Used when the unichr built-in is referenced (Use chr in Python 3)

## map-builtin-not-iterating

#### W1636 - map built-in referenced when not iterating

Used when the map built-in is referenced in a non-iterating context
(returns an iterator in Python 3)

## zip-builtin-not-iterating

#### W1637 - zip built-in referenced when not iterating

Used when the zip built-in is referenced in a non-iterating context
(returns an iterator in Python 3)

## range-builtin-not-iterating

#### W1638 - range built-in referenced when not iterating

Used when the range built-in is referenced in a non-iterating context
(returns an iterator in Python 3)

## filter-builtin-not-iterating

#### W1639 - filter built-in referenced when not iterating

Used when the filter built-in is referenced in a non-iterating context
(returns an iterator in Python 3)

## using-cmp-argument

#### W1640 - Using the cmp argument for list.sort / sorted

Using the cmp argument for list.sort or the sorted builtin should be
avoided, since it was removed in Python 3. Using either `key` or
`functools.cmp_to_key` should be preferred.

## eq-without-hash

#### W1641 - Implementing **eq** without also implementing **hash**

Used when a class implements **eq** but not **hash**. In Python 2,
objects get object.**hash** as the default implementation, in Python 3
objects get None as their default **hash** implementation if they also
implement **eq**.

## div-method

#### W1642 - **div** method defined

Used when a **div** method is defined. Using `__truediv__` and
setting\_\_div\_\_ = **truediv** should be preferred.(method is not used
by Python 3)

## idiv-method

#### W1643 - **idiv** method defined

Used when an **idiv** method is defined. Using `__itruediv__` and
setting\_\_idiv\_\_ = **itruediv** should be preferred.(method is not
used by Python 3)

## rdiv-method

#### W1644 - **rdiv** method defined

Used when a **rdiv** method is defined. Using `__rtruediv__` and
setting\_\_rdiv\_\_ = **rtruediv** should be preferred.(method is not
used by Python 3)

## exception-message-attribute

#### W1645 - Exception.message removed in Python 3

Used when the message attribute is accessed on an Exception. Use
str(exception) instead.

## invalid-str-codec

#### W1646 - non-text encoding used in str.decode

Used when using str.encode or str.decode with a non-text encoding. Use
codecs module to handle arbitrary codecs.

## sys-max-int

#### W1647 - sys.maxint removed in Python 3

Used when accessing sys.maxint. Use sys.maxsize instead.

## bad-python3-import

#### W1648 - Module moved in Python 3

Used when importing a module that no longer exists in Python 3.

## deprecated-string-function

#### W1649 - Accessing a deprecated function on the string module

Used when accessing a string function that has been deprecated in Python
3.

## deprecated-str-translate-call

#### W1650 - Using str.translate with deprecated deletechars parameters

Used when using the deprecated deletechars parameters from
str.translate. Use re.sub to remove the desired characters

## deprecated-itertools-function

#### W1651 - Accessing a deprecated function on the itertools module

Used when accessing a function on itertools that has been removed in
Python 3.

## deprecated-types-field

#### W1652 - Accessing a deprecated fields on the types module

Used when accessing a field on types that has been removed in Python 3.

## next-method-defined

#### W1653 - next method defined

Used when a next method is defined that would be an iterator in Python 2
but is treated as a normal function in Python 3.

## dict-items-not-iterating

#### W1654 - dict.items referenced when not iterating

Used when dict.items is referenced in a non-iterating context (returns
an iterator in Python 3)

## dict-keys-not-iterating

#### W1655 - dict.keys referenced when not iterating

Used when dict.keys is referenced in a non-iterating context (returns an
iterator in Python 3)

## dict-values-not-iterating

#### W1656 - dict.values referenced when not iterating

Used when dict.values is referenced in a non-iterating context (returns
an iterator in Python 3)

## deprecated-operator-function

#### W1657 - Accessing a removed attribute on the operator module

Used when accessing a field on operator module that has been removed in
Python 3.

## deprecated-urllib-function

#### W1658 - Accessing a removed attribute on the urllib module

Used when accessing a field on urllib module that has been removed or
moved in Python 3.

## xreadlines-attribute

#### W1659 - Accessing a removed xreadlines attribute

Used when accessing the xreadlines() function on a file stream, removed
in Python 3.

## deprecated-sys-function

#### W1660 - Accessing a removed attribute on the sys module

Used when accessing a field on sys module that has been removed in
Python
3.

## exception-escape

#### W1661 - Using an exception object that was bound by an except handler

Emitted when using an exception, that was bound in an except handler,
outside of the except handler. On Python 3 these exceptions will be
deleted once they get out of the except handler.

## comprehension-escape

#### W1662 - Using a variable that was bound inside a comprehension

Emitted when using a variable, that was bound in a comprehension
handler, outside of the comprehension itself. On Python 3 these
variables will be deleted outside of the comprehension.

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