BUG: Fixed assign failure when with Copy-on-Write #60941
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Since there has been no feedback for two weeks, just a friendly ping @mroeschke @rhshadrach @WillAyd , thanks 🙏 |
pandas/tests/indexing/test_iloc.py
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| # Check that view is modified correctly | ||
| expected_view = DataFrame( | ||
| {"B": [2, 2, 2, 2], "C": [3, 2, 1, 2]}, index=df.index | ||
| ) | ||
| tm.assert_frame_equal(df, expected_view) |
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Nit: Once the assignment is done, this is no longer a view. Can you change to just "df" instead of "view".
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Sure, sovled in fcffbf2
doc/source/whatsnew/v2.3.0.rst
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| @@ -37,6 +37,7 @@ Other enhancements | |||
| updated to work correctly with NumPy >= 2 (:issue:`57739`) | |||
| - :meth:`Series.str.decode` result now has ``StringDtype`` when ``future.infer_string`` is True (:issue:`60709`) | |||
| - :meth:`~Series.to_hdf` and :meth:`~DataFrame.to_hdf` now round-trip with ``StringDtype`` (:issue:`60663`) | |||
| - The :meth:`DataFrame.iloc` now works correctly with ``copy_on_write`` option (:issue:`60309`) | |||
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Can you give a little more detail here. Perhaps adding
after subsetting the columns of a DataFrame and using a slice
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Sure, Solved in 725b41b
| if isinstance(indexer[1], slice) and indexer[1] == slice(None): | ||
| col_indexer = slice(None) | ||
| else: | ||
| col_indexer = np.arange(len(blk_loc)) | ||
| self.blocks[0].setitem((indexer[0], col_indexer), value) |
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It's not clear to me why it's correct to pass through slice(None) but not other cases, e.g. slice(0, 3, 2) or [0, 1].
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I think you're right. My current changes failed under the following test case. I'll mark the PR as a draft until I properly handle the bug and will also add more test cases. Thanks!
dftest3 = pd.DataFrame(
{"A": [1, 4, 1, 5], "B": [2, 5, 2, 6], "C": [3, 6, 1, 7], "D": [8, 9, 10, 11]}
)
df3 = dftest3[["B", "C", "D"]]
df3.iloc[[1, 3], 0:3:2] = [[2, 2], [2, 2]]
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This pull request is stale because it has been open for thirty days with no activity. Please update and respond to this comment if you're still interested in working on this. |
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Thanks for the pull request, but it appears to have gone stale. If interested in continuing, please merge in the main branch, address any review comments and/or failing tests, and we can reopen. |
doc/source/whatsnew/v2.3.0.rstfile if fixing a bug or adding a new feature.