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rhshadrach avatar rhshadrach commented on June 29, 2024

Thanks for the report!

(No reindexing should be necessary since no rows are selected with code on line 3.)

To be sure, it's not the left hand side that is reindexing, it's the right. E.g.

df.loc[df[0].str.len() > 1, 0] = 5

works. I believe we raise anytime the RHS has a duplicate value because the result can be ambiguous, even though it won't necessarily be ambiguous. In general we try to avoid values-dependent behavior. In this case, if it just so happens that in one case the mask on the left is all False you may think the code works, but will then fail as soon as it isn't all False. That can be a bad user experience.

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rhshadrach avatar rhshadrach commented on June 29, 2024

Code executes normally with panda versions <2.1.0

Ah, I missed this! Thanks for that detail. We should run a git blame and see where this ended up getting changed.

from pandas.

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