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https://github.com/pex-tool/pex

A tool for generating .pex (Python EXecutable) files, lock files and venvs.
https://github.com/pex-tool/pex

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A tool for generating .pex (Python EXecutable) files, lock files and venvs.

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README 

        
***

PEX

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.. contents:: **Contents**



Overview

========

pex is a library for generating .pex (Python EXecutable) files which are

executable Python environments in the spirit of `virtualenvs `_.

pex is an expansion upon the ideas outlined in

`PEP 441 `_

and makes the deployment of Python applications as simple as ``cp``.  pex files may even

include multiple platform-specific Python distributions, meaning that a single pex file

can be portable across Linux and OS X.



pex files can be built using the ``pex`` tool.  Build systems such as `Pants

`_, `Buck `_, and  `{py}gradle `_  also

support building .pex files directly.



Still unsure about what pex does or how it works?  Watch this quick lightning

talk: `WTF is PEX? `_.



pex is licensed under the Apache2 license.



Installation

============



To install pex, simply



.. code-block:: bash



    $ pip install pex



You can also build pex in a git clone using tox:



.. code-block:: bash



    $ tox -e package

    $ cp dist/pex ~/bin



This builds a pex binary in ``dist/pex`` that can be copied onto your ``$PATH``.

The advantage to this approach is that it keeps your Python environment as empty as

possible and is more in-line with what pex does philosophically.



Simple Examples

===============



Launch an interpreter with ``requests``, ``flask`` and ``psutil`` in the environment:



.. code-block:: bash



    $ pex requests flask 'psutil>2,<3'



Save Dependencies From Pip

~~~~~~~~~~~~~~~~~~~~~~~~~~



Or instead freeze your current virtualenv via requirements.txt and execute it anywhere:



.. code-block:: bash



    $ pex $(pip freeze) -o my_virtualenv.pex

    $ deactivate

    $ ./my_virtualenv.pex



Ephemeral Environments

~~~~~~~~~~~~~~~~~~~~~~



Run webserver.py in an environment containing ``flask`` as a quick way to experiment:



.. code-block:: bash



    $ pex flask -- webserver.py



Launch Sphinx in an ephemeral pex environment using the Sphinx entry point ``sphinx:main``:



.. code-block:: bash



    $ pex sphinx -e sphinx:main -- --help



Using Entry Points

~~~~~~~~~~~~~~~~~~



Projects specifying a ``console_scripts`` entry point in their configuration

can build standalone executables for those entry points.



To build a standalone ``pex-tools-executable.pex`` binary that runs the

``pex-tools`` console script found in all pex version ``2.1.35`` and newer distributions:



.. code-block:: bash



    $ pex "pex>=2.1.35" --console-script pex-tools --output-file pex-tools-executable.pex



Specifying A Specific Interpreter

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



You can also build pex files that use a specific interpreter type:



.. code-block:: bash



    $ pex "pex>=2.1.35" -c pex-tools --python=pypy -o pex-tools-pypy-executable.pex



Most pex options compose well with one another, so the above commands can be

mixed and matched, and equivalent short options are available.



For a full list of options, just type ``pex --help``.



Integrating pex into your workflow

==================================



If you use tox (and you should!), a simple way to integrate pex into your

workflow is to add a packaging test environment to your ``tox.ini``:



.. code-block:: ini



    [testenv:package]

    deps = pex

    commands = pex . -o dist/app.pex



Then ``tox -e package`` will produce a relocatable copy of your application

that you can copy to staging or production environments.



Documentation

=============



More documentation about Pex, building .pex files, and how .pex files work

is available at https://docs.pex-tool.org.



Development

===========



Pex uses `tox `_ for test and development automation. To run

the test suite, just invoke tox:



.. code-block:: bash



    $ tox



If you don't have tox, you can generate a pex of tox:



.. code-block::



    $ pex tox -c tox -o ~/bin/tox



Tox provides many useful commands and options, explained at https://tox.wiki/en/latest/ .

Below, we provide some of the most commonly used commands used when working on Pex, but the

docs are worth acquainting yourself with to better understand how Tox works and how to do more

advanced commands.



To run a specific environment, identify the name of the environment you'd like to invoke by

running ``tox --listenvs-all``, then invoke like this:



.. code-block::



    $ tox -e fmt



To run MyPy:



.. code-block::



    $ tox -e check



All of our tox test environments allow passthrough arguments, which can be helpful to run

specific tests:



.. code-block::



    $ tox -e py37-integration -- -k test_reproducible_build



To run Pex from source, rather than through what is on your PATH, invoke via Python:



.. code-block::



    $ python -m pex