SimpleITKPythonPackage

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SimpleITKPythonPackage

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A setup script to generate a Python Wheels

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# SimpleITKPythonPackage

This project provides a `setup.py` script that can build, install, and package SimpleITK for Python. [SimpleITK](http://www.simpleitk.org) is a simplified programming layer on top of the [Insight Segmentation and Registration Toolkit](https://itk.org) (ITK).  ITK is an open-source, cross-platform system that provides developers with an extensive suite of software tools for image analysis.

SimpleITK is available for binary downloads from [PyPI](https://pypi.python.org/pypi/SimpleITK) for many common platforms. Also a source distribution is available of this repository which may be used when an appropriate binary [wheel](http://pythonwheels.com) is not available.

To install SimpleITK:

```bash
pip install SimpleITK
```

## Installing SimpleITK for Python from the Python Packaging Source

```bash
pip install --no-binary :all: SimpleITK
```

### Prerequisites

The build requirements are specified in the pyproject.toml file via [PEP 518](https://peps.python.org/pep-0518/). The requirements should be automatically downloaded when using a [PEP 517](https://peps.python.org/pep-0517/) compliant build front-end.

Additionally building *requires*:
* Git
* C++ Compiler - Platform specific requirements are summarized in [scikit-build documentation](http://scikit-build.readthedocs.io).
* Python
  * pip >= 9.0.0
  
Please ensure that `pip` is up to date.

```bash
python -m pip install --upgrade pip
```

### Compilations and Installation from Github

SimpleITK can be compiled and install directly from the github repository:

```bash
pip install git+https://github.com/SimpleITK/SimpleITKPythonPackage.git -v
```

### Compilation and Installation from Source Distribution

Alternatively, SimpleITK for Python can be compiled and installed from the SimpleITKPythonPackage python source distribution.

```bash
pip install SimpleITKPythonPackage-1.0.0.tar.gz
```

The source distributions are available from [PyPI](https://pypi.python.org/pypi/SimpleITK).

## Automated wheels building with scripts

Steps required to build wheels on Linux, MacOSX and Windows have been automated. The
following sections outline how to use the associated scripts.

### Linux

On any linux distribution with `docker` and `bash` installed, running the script
`dockcross-manylinux-build-wheels.sh` will create 32 and 64-bit wheels for both
python 2.x and python 3.x in the `dist` directory.

For example:

```bash
$ git clone git://github.com/SimpleITK/SimpleITKPythonPackage.git
[...]

$ ./scripts/dockcross-manylinux-build-wheels.sh
[...]

$ ls -1 dist/
SimpleITK-0.11.0-cp27-cp27m-manylinux1_i686.whl
SimpleITK-0.11.0-cp27-cp27m-manylinux1_x86_64.whl
SimpleITK-0.11.0-cp27-cp27mu-manylinux1_i686.whl
SimpleITK-0.11.0-cp27-cp27mu-manylinux1_x86_64.whl
SimpleITK-0.11.0-cp33-cp33m-manylinux1_i686.whl
SimpleITK-0.11.0-cp33-cp33m-manylinux1_x86_64.whl
SimpleITK-0.11.0-cp34-cp34m-manylinux1_i686.whl
SimpleITK-0.11.0-cp34-cp34m-manylinux1_x86_64.whl
SimpleITK-0.11.0-cp35-cp35m-manylinux1_i686.whl
SimpleITK-0.11.0-cp35-cp35m-manylinux1_x86_64.whl
```

## Prerequisites

Building wheels requires:
* [CMake](https://cmake.org)
* Git
* C++ Compiler - Platform specific requirements are summarized in [scikit-build documentation](http://scikit-build.readthedocs.io).
* Python

## Detailed build instructions

### Building SimpleITK Python wheels

Build the SimpleITK Python wheel with the following command:

```
python -m build .
```
### Building Source Distribution

The Python [build](https://pypa-build.readthedocs.io/en/latest/) package should be used to build the source distribution:

```
python -m build --sdist .
```

### Efficiently building wheels for different version of python

If on a given platform you would like to build wheels for different version of python, you can build the SimpleITK core libraries first and reuse them when building each wheel.

Here are the steps:

1. Build `SimpleITKPythonPackage` with `SimpleITKPythonPackage_BUILD_PYTHON` set to `OFF`

2. Build "flavor" of package using:

```
python setup.py bdist_wheel -- \
  -DSimpleITK_DIR:PATH=/path/to/SimpleITKPythonPackage-core-build/SimpleITK-superbuild/SimpleITK-build \
  -DSWIG_EXECUTABLE:PATH=/path/to/SimpleITKPythonPackage-core-build/SimpleITK-superbuild/Swig/bin/swig
```

## Miscellaneous
Written by Jean-Christophe Fillion-Robin from Kitware Inc.

It is covered by the Apache License, Version 2.0:

http://www.apache.org/licenses/LICENSE-2.0

For more information about SimpleITK, visit http://simpleitk.org

For more information about ITK, visit http://itk.org

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