CoW: Boolean indexer in MultiIndex raising read-only error #56635
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phofl added Blocker 
phofl commented Dec 27, 2023
pandas/core/indexes/multi.py Outdated
| "is not the same length as the index" | ||
| ) | ||
| lvl_indexer = np.asarray(k) | ||
| lvl_indexer = np.asarray(k).copy() |
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Not copying here propagates all the way to the input mask
phofl added the Indexing 
mroeschke approved these changes Dec 28, 2023
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| Thanks @phofl |
meeseeksmachine pushed a commit to meeseeksmachine/pandas that referenced this pull request Dec 28, 2023
…ing read-only error
cbpygit pushed a commit to cbpygit/pandas that referenced this pull request Jan 2, 2024
…v#56635) * CoW: Boolean indexer in MultiIndex raising read-only error * Fixup * Add whatsnew
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Found this while going through the docs