pandas: Does not recognize module pandas.testing

[DannyNemer]

Environment

• Language Server: v2020.12.2
• OS: macOS v10.15.6
• Python: v3.7.9
• Pandas: v1.1.5 (latest)

Expected behavior

Recognize the module pandas.testing.

Actual behavior

Pylance does not recognize pandas.testing:

Code Snippet

import pandas as pd

pd.testing.assert_frame_equal(pd.DataFrame(), pd.DataFrame())

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Please let me know how I can improve this bug report because many more will follow (all for typeshed issues). Is this the best repo for such bug reports? (I am following the precedent of Pandas type issues in the release notes.)

[jakebailey]

I think there's some question as to whether or not this is considered a part of the pandas API in this manner, as opposed to importing pandas.testing directly; IIRC this module is exposed via a side effect of Python imports done in the pandas __init__.py. If so, the fix will be to add it as an exported variable in our pandas stubs.

[gramster]

As far as I can tell the functions in testing are not documented and so I would probably not export them in the stubs. Our stub file is named _testing.pyi though so even importing testing will not add them; perhaps we should make some adjustment for that? I don't know how widely used these are.

[jakebailey]

This issue has been fixed in version 2021.5.0, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/main/CHANGELOG.md#202150-5-may-2021