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Python fixed-width to/from dict converter.

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Easy two-way conversion between Python dictionaries and fixed-width files.
The FixedWidth class has been used in production without modification for 
several years.

This module has also proven useful for "debugging" a fixed-width spec --
an invalid configuration reports an error that may not be obvious from
reading the spec document.

Requires a 'config' dictonary. See unit tests for full example.

Small example

```python
SAMPLE_CONFIG = {

'first_name': {
		'required': True,
		'type': 'string',
		'start_pos': 1,
		'end_pos': 10,
		'alignment': 'left',
		'padding': ' '
	},

'last_name': {
		'required': True,
		'type': 'string',
		'start_pos': 11,
		'end_pos': 30,
		'alignment': 'left',
		'padding': ' '
	},

'date': {
		'required': True,
		'type': 'date',
		'start_pos': 31,
		'end_pos': 38,
		'alignment': 'left',
		'format': '%Y%m%d',
		'padding': ' '
	},

'decimal': {
		'required': True,
		'type': 'decimal',
		'precision': 2,
		'rounding': decimal.ROUND_UP,
		'start_pos': 38,
		'end_pos': 42,
		'alignment': 'left',
		'padding': ' '
	},

}
```

Notes:

* A field must have a start_pos and either an end_pos or a length. If both an end_pos and a length are provided, they must not conflict.

* A field may not have a default value if it is required.

* Supported types are string, integer, and decimal.

* Alignment and padding are required.

License: BSD

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