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doc/python: Add pythonImportsCheck mention

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Jonathan Ringer 2020-08-17 13:33:43 -07:00
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doc/languages-frameworks/python.section.md
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@ -543,9 +543,9 @@ Note also the line `doCheck = false;`, we explicitly disabled running the test-s
It is highly encouraged to have testing as part of the package build. This
helps to avoid situations where the package was able to build and install,
but is not usable at runtime. Currently, all packages will use the `test`
command provided by the setup.py. However, this is currently deprecated
https://github.com/pypa/setuptools/pull/1878 and your package should provide
it's own checkPhase.
command provided by the setup.py (i.e. `python setup.py test`). However,
this is currently deprecated https://github.com/pypa/setuptools/pull/1878
and your package should provide its own checkPhase.
*NOTE:* The `checkPhase` for python maps to the `installCheckPhase` on a
normal derivation. This is due to many python packages not behaving well
@ -632,7 +632,29 @@ Trying to concatenate the related strings to disable tests in a regular checkPha
would be much harder to read. This also enables us to comment on why specific tests
are disabled.
#### Develop local package
#### Using pythonImportsCheck
Although unit tests are highly prefered to valid correctness of a package. Not
all packages have test suites that can be ran easily, and some have none at all.
To help ensure the package still works, `pythonImportsCheck` can attempt to import
the listed modules.
```
pythonImportsCheck = [ "requests" "urllib" ];
```
roughly translates to:
```
postCheck = ''
PYTHONPATH=$out/${python.sitePackages}:$PYTHONPATH
python -c "import requests; import urllib"
'';
```
However, this is done in it's own phase, and not dependent on whether `doCheck = true;`
This can also be useful in verifying that the package doesn't assume commonly
present packages (e.g. `setuptools`)
### Develop local package
As a Python developer you're likely aware of [development mode](http://setuptools.readthedocs.io/en/latest/setuptools.html#development-mode)
(`python setup.py develop`); instead of installing the package this command