BUG: Allow __name__less callables as groupby hows (GH7929) #7974
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pandas/core/common.py
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if this fails it returns None? (not sure what would hit that, but maybe make explicit)?
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Yeah, it returns None, not the empty string (assert getname(1) is None), if it can't figure out what do to. You'd have to work pretty hard to have something callable which didn't have __call__.. I can add a comment/return None if you'd like, though.
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yep an explicty None return (and/or comment) is good. lmk after you push and green.
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@dsm054 minor comment, otherwise looks good |
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Explicit |
jreback
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BUG: Allow __name__less callables as groupby hows (GH7929)
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thanks! |
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Allow
functools.partialobjects (and similar callables without__name__attributes) to be used asgroupbyfunctions, which also adds support along the tree (e.g.resample, which is specifically tested.)Closes #7929.
This does not address the potential enhancements allowing automatic naming of duplicate-named functions (relatively minor) and the use of a Series to specify names (more useful).