Welcome to PyEnvDiff’s documentation!

Contents:

PyEnvDiff

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Python environment comparison tool. Maximized for compatibility between versions 2.6 to 3.8, pypy, operating systems, distributions, and forks! Virtualenv, pyenv, pyvenv, conda and system!

via Command-Line

From the command line, to get information on the current environment:

python -m pyenvdiff.info

Serialize the information to a file…

python -m pyenvdiff.info my_environment.json

Switch to another environment (you’ll need pyenvdiff installed in both)

python -m pyenvdiff.compare my_environment.json

Or compare two from any environment

python -m pyenvdiff.compare my_environment.json my_other_environment.json

via Hub-Based Compare

An HTTP-based service comes with pyenvdiff, all without dependencies (thanks to a copy of bottle). It stores environment information in RAM, for as long as it runs. This service should be considered alpha-stage.

To launch the built-in hub (server):

python -m pyenvdiff.hub

Then navigate in your browser to the URL it gives you to see the menu of available options. Before you send information about other environments on the same machine, your options will be limited to just viewing the server’s environment.

Samples of the Hub Landing Page and the Environment Information Page illustrate the features.

From one or more other environments run:

python -m pyenvdiff.post_to_hub

A URL will be displayed to view environment information from any machine on the same network.

Navigate back to the base URL, you’ll see more options to compare the two environments.

A Sample of the Environment Diff Page illustrate what the diff can do (if `ghdiff` is installed for the hub).

Programmatic Usage

>>> from pyenvdiff import Environment

>>> e = Environment()
>>> e.to_file('my_env.json')

>>> o = Environment.from_file('other_env.json')

>>> e == o
True

>>> print(e)
... # prints a dump of the environment details

>>> from pyenvdiff import EnvironmentDiff
>>> ed = EnvironmentDiff(e, o)
>>> print(ed)
... # prints a diff of the two environments

Sooo much room for activities!

  • Compare dev, test & prod!
  • Works on my machine, strange it doesn’t work on yours
  • Confirming deployments
  • Auditing user desktops, servers, research environments & ecosystems
  • Filing (or requesting) bug reports

Installation

There are no mandatory, nor automatically installing, dependencies. There are optional dependencies which increase.

pip install pyenvdiff

OR just copy & paste pyenvdiff anywhere on PYTHONPATH

There is one optional dependency. The core functionality doesn’t use it. It’s only needed for pretty HTML-based comparisons via the web.

pip install ghdiff

Under the hood

  • Robust and organized object model collects and serializes environment information.
  • Zero dependency, pure-python, harmless install! Simply pip install pyenvdiff or copy anywhere on PYTHONPATH.
  • As-needed import statements, to maximize compatibility across python flavours.
  • Favours compatible python-code over succinct or newer-style python-code
  • Free software: BSD license
  • Documentation: https://pyenvdiff.readthedocs.io.

Credits

This package was started with Cookiecutter and the audreyr/cookiecutter-pypackage project template.

Installation

Stable release

To install PyEnvDiff, run this command in your terminal:

$ pip install pyenvdiff

This is the preferred method to install PyEnvDiff, as it will always install the most recent stable release.

If you don’t have pip installed, this Python installation guide can guide you through the process.

From sources

The sources for PyEnvDiff can be downloaded from the Github repo.

You can either clone the public repository:

$ git clone git://github.com/jnmclarty/pyenvdiff

Or download the tarball:

$ curl  -OL https://github.com/jnmclarty/pyenvdiff/tarball/master

Once you have a copy of the source, you can install it with:

$ python setup.py install

Usage

To use PyEnvDiff in a project:

import pyenvdiff

Contributing

Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

You can contribute in many ways:

Types of Contributions

Report Bugs

Report bugs at https://github.com/jnmclarty/pyenvdiff/issues.

If you are reporting a bug, please include:

  • Your operating system name and version.
  • Any details about your local setup that might be helpful in troubleshooting.
  • Detailed steps to reproduce the bug.

Fix Bugs

Look through the GitHub issues for bugs. Anything tagged with “bug” and “help wanted” is open to whoever wants to implement it.

Implement Features

Look through the GitHub issues for features. Anything tagged with “enhancement” and “help wanted” is open to whoever wants to implement it.

Write Documentation

PyEnvDiff could always use more documentation, whether as part of the official PyEnvDiff docs, in docstrings, or even on the web in blog posts, articles, and such.

Submit Feedback

The best way to send feedback is to file an issue at https://github.com/jnmclarty/pyenvdiff/issues.

If you are proposing a feature:

  • Explain in detail how it would work.
  • Keep the scope as narrow as possible, to make it easier to implement.
  • Remember that this is a volunteer-driven project, and that contributions are welcome :)

Get Started!

Ready to contribute? Here’s how to set up pyenvdiff for local development.

  1. Fork the pyenvdiff repo on GitHub.

  2. Clone your fork locally:

    $ git clone git@github.com:your_name_here/pyenvdiff.git
    
  3. Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed, this is how you set up your fork for local development:

    $ mkvirtualenv pyenvdiff
    $ cd pyenvdiff/
    $ pip install -r requirements_dev.txt
    $ python setup.py develop
    
  4. Create a branch for local development:

    $ git checkout -b name-of-your-bugfix-or-feature
    

    Now you can make your changes locally.

  5. When you’re done making changes, check that your changes pass flake8 and the tests, including testing other Python versions with tox:

    $ flake8 pyenvdiff tests
    $ python setup.py test or py.test
    $ tox
    

    To get flake8 and tox, just pip install them into your virtualenv.

  6. Commit your changes and push your branch to GitHub:

    $ git add .
    $ git commit -m "Your detailed description of your changes."
    $ git push origin name-of-your-bugfix-or-feature
    
  7. Submit a pull request through the GitHub website.

Pull Request Guidelines

Before you submit a pull request, check that it meets these guidelines:

  1. The pull request should include tests.
  2. If the pull request adds functionality, the docs should be updated. Put your new functionality into a function with a docstring, and add the feature to the list in README.rst.
  3. The pull request should work for Python 2.6, 2.7, 3.3, 3.4 and 3.5, and for PyPy. Check https://travis-ci.org/jnmclarty/pyenvdiff/pull_requests and make sure that the tests pass for all supported Python versions.

Tips

To run a subset of tests:

$ py.test tests.test_pyenvdiff

Indices and tables