Problem discussion

[merwok]

The problem seems to be that your requirements are not complete, i.e. not produced by pip freeze or pip-compile. In the first run, pip-sync installs pytest and its dependencies (py) implicitly; in the second run, py is removed because it’s not listed in the requirements file.

The correct flow is: write your direct dependencies in .in files (e.g. pytest in test-requirements.in), generate the list of all depencies with constraints resolved and exact versions (this will put pytest and py in test-requirements.txt). pip-sync will then work as expected.

[nicain]

Something like described here?

http://jamescooke.info/a-successful-pip-tools-workflow-for-managing-python-package-requirements.html

[merwok]

Something like exactly what the pip-tools docs describe! They edited the readme recently to make it even clearer than pip-sync needs frozen (complete) requirement files.

[nicain]

AWESOME! Pushed a complete fixed branch here: https://github.com/nicain/reproduce_tox_issue/tree/fix

@merwok thanks for all your help. I am still learning all of this workflow, and I really appreciate you taking the time to educate me :)

[merwok]

Glad to help! Happy solstice!

[merwok]

test requirements should not include (with -r) the base requirements. See discussions in the open issues of pip-tools for more info.

[nicain]

OK. I was following (my interpretation of) jazzband/pip-tools#398 (comment)

Is there a change in https://github.com/nicain/reproduce_tox_issue/tree/fix that I should make?

[merwok]

See these discussions:
jazzband/pip-tools#573 (comment)
nedbat/django_coverage_plugin#44

The change needed is: remove -r requirements.txt from test-requirements.in

[nicain]

Oh, I think I see; because of:

commands =
    pip-sync requirements.txt requirements-test.txt
    pyflakes project
    pytest {posargs}

Any runtime req's in requirements.in (converted to requirements.txt) are already taken care of. This keeps requirements.txt (converted from requirements.in) clean, and only listing the testing dep's, right?

[merwok]

Exactly.