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DEPR: Raise FutureWarning about raising an error in __array__ when copy=False cannot be honored #60395

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@KevsterAmp KevsterAmp changed the base branch from main to 2.3.x November 22, 2024 13:44
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Thanks, looking good!

If you remove the error, you will have to update some tests that are now checking for an error (change that to check for a warning, with tm.assert_produces_warning)

And see the issue for a suggestion to expand the message.

Comment on lines +666 to +668
import warnings

from pandas.util._exceptions import find_stack_level
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You can move those warnings to the top of the file

"raise an error when a zero-copy numpy array is not possible",
FutureWarning,
stacklevel=find_stack_level(),
)
# TODO: By using `zero_copy_only` it may be possible to implement this
raise ValueError(
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This error should then be removed (we are adding the warning instead of the error, to warn people it will error in the future).

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Gotcha, I initially thought we would raise both an error and a warning.

Comment on lines +1675 to +1677
import warnings

from pandas.util._exceptions import find_stack_level
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Same here about the imports (and similar for next cases)

"raise an error when a zero-copy numpy array is not possible",
FutureWarning,
stacklevel=find_stack_level(),
)
raise ValueError(
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And same for the errors

@jorisvandenbossche jorisvandenbossche added this to the 2.3 milestone Nov 22, 2024
@jorisvandenbossche jorisvandenbossche added Compat pandas objects compatability with Numpy or Python functions Deprecate Functionality to remove in pandas labels Nov 23, 2024
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Thanks for the review despite this PR being in draft. Working on the tests and changes based on the comments, will mark it as ready once done

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DEPR: deprecate / warn about raising an error in __array__ when copy=False cannot be honore
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