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Setup

If you plan on hacking on psutil this is what you're supposed to do first:

  • clone the GIT repository:

    $ git clone git@github.com:giampaolo/psutil.git

  • install system deps (see install instructions).

  • install development deps; these are useful for running tests (e.g. mock, unittest2), building doc (e.g. sphinx), running linters (flake8), etc.

    $ make setup-dev-env

  • bear in mind that make (see Makefile) is the designated tool to run tests, build etc. and that it is also available on Windows (see make.bat).

  • (UNIX only) run make install-git-hooks: this will reject your commit if python code is not PEP8 compliant.

  • run make test to run tests.

Coding style

  • python code strictly follows PEP 8 styling guides and this is enforced by make install-git-hooks.
  • C code strictly follows PEP 7 styling guides.

Makefile

Some useful make commands:

$ make install        # install
$ make test           # run all tests
$ make test-memleaks  # run memory leak tests
$ make coverage       # run test coverage
$ make flake8         # run PEP8 linter

Adding a new feature

Usually the files involved when adding a new functionality are:

psutil/__init__.py                   # main psutil namespace
psutil/_ps{platform}.py              # python platform wrapper
psutil/_psutil_{platform}.c          # C platform extension
psutil/_psutil_{platform}.h          # C header file
psutil/tests/test_process|system.py  # main test suite
psutil/tests/test_{platform}.py      # platform specific test suite

Typical process occurring when adding a new functionality (API):

  • define the new function in psutil/__init__.py.
  • write the platform specific implementation in psutil/_ps{platform}.py (e.g. psutil/_pslinux.py).
  • if the change requires C, write the C implementation in psutil/_psutil_{platform}.c (e.g. psutil/_psutil_linux.c).
  • write a generic test in psutil/tests/test_system.py or psutil/tests/test_process.py.
  • if possible, write a cross platform test in psutil/tests/test_{platform}.py (e.g. test_linux.py).
  • update doc in doc/index.py.
  • update HISTORY.rst.
  • update README.rst (if necessary).
  • make a pull request.

Continuous integration

All of the services listed below are automatically run on git push.

Unit tests

Tests are automatically run for every GIT push on Linux, OSX and Windows by using:

Test files controlling these are .travis.yml and appveyor.yml. Both services run psutil test suite against all supported python version (2.6 - 3.5). Two icons in the home page (README) always show the build status:

Linux tests (Travis) Windows tests (Appveyor)

OSX, FreeBSD and Solaris are currently tested manually (sigh!).

Test coverage

Test coverage is provided by coveralls.io, it is controlled via .travis.yml and it is updated on every git push. An icon in the home page (README) always shows the last coverage percentage:

Test coverage (coverall.io)

Documentation

Releasing a new version

These are note for myself (Giampaolo):

  • make sure all tests pass and all builds are green.
  • upload source tarball on PYPI with make upload-src.
  • upload exe and wheel files for windows on PYPI with make upload-all.
  • upload updated doc on http://pythonhosted.org/psutil with make upload-doc.
  • GIT tag the new release with make git-tag-release.
  • post on psutil and python-announce mailing lists, twitter, g+, blog.