REF: avoid result=None case in _python_agg_general #29499
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gfyoung
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Groupby
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pandas/core/groupby/groupby.py
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| for name, obj in self._iterate_slices(): | ||
| if self.grouper.ngroups == 0: | ||
| # agg_series below assumes ngroups > 0 | ||
| # 3 test cases get here |
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Nit: somewhat on the fence regarding the necessity and usefulness of this comment
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fair enough. its for my own reference in trying to move these checks earlier
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Similar comment on another PR but would ideally not special case things like this in groupby functions. Is there an actual issue in allowing this to follow the same code paths as when ngroups is non-zero?
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@WillAyd that goal is the reason for the "3 test cases" comment (which I'll remove). I want to identify the cases that get here and make this check unnecessary. But its much clearer to do this check and not end up with None on L914 and not be clear on how that happened.
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thanks |
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cc @WillAyd @jreback, orthogonal to other groupby PRs.