Fix duplicated imports with importlib mode and doctest-modules #11148
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Hmm not sure why pypy3 build failed, it broke during tox setup. |
bluetech
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jaraco
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Good news is this does work to fix most of the test failures in pmxbot, so it's a good fix. Bad news is there's still two import-related failures that may have a different root cause. I'll investigate those, put together another reproducer and possibly file a new issue (if distinct). Regardless, this fix here seems solid, so feel free to merge. Update: the other issue appears to be a manifestation of #10337. |
jaraco
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The initial implementation (in pytest-dev#7246) introduced the `importlib` mode, which never added the imported module to `sys.modules`, so it included a test to ensure calling `import_path` twice would yield different modules. Not adding modules to `sys.modules` proved problematic, so we began to add the imported module to `sys.modules` in pytest-dev#7870, but failed to realize that given we are now changing `sys.modules`, we might as well avoid importing it more than once. Then pytest-dev#10088 came along, passing `importlib` also when importing application modules (as opposed to only test modules before), which caused problems due to imports having side-effects and the expectation being that they are imported only once. With this PR, `import_path` returns the module immediately if already in `sys.modules`. Fix pytest-dev#10811, pytest-dev#10341
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Thanks for the bug fix! Is there a plan to backport this to 7.4? If not, would this be part of a minor release or a major release? |
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Thanks @akhilramkee! Yes backporting makes sense, on it now. |
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The initial implementation (in #7246) introduced the
importlibmode, which never added the imported module tosys.modules, so it included a test to ensure callingimport_pathtwice would yield different modules.Not adding modules to
sys.modulesproved problematic, so we began to add the imported module tosys.modulesin #7870, but failed to realize that given we are now changingsys.modules, we might as well avoid importing it more than once.Then #10088 came along, passing
importlibalso when importing application modules to collect docstrings (as opposed to only test modules before), which caused problems due to imports having side-effects and the expectation being that they are imported only once.With this PR,
import_pathreturns the module immediately if already insys.modules.Fix #10811
Fix #10341