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DEPR: indexing Series with single-entry list #31333

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merged 6 commits into from Feb 9, 2020

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jbrockmendel
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@jbrockmendel jbrockmendel commented Jan 27, 2020

Could use a better warning message, suggestions welcome.

@jbrockmendel jbrockmendel added Deprecate Functionality to remove in pandas Indexing Related to indexing on series/frames, not to indexes themselves labels Jan 29, 2020
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This seems reasonable. Will users see this warning in addition to the warnings in #31299 (comment)?

Will need a whatsnew note.

# GH#31299
warnings.warn(
"Indexing with a single-item list containing a "
"slice is deprecated and will raise in a future "
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Do we know what it will raise? Or will it depend on the value?

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Best guess is TypeError, depends on where we let it fall through

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Will users see this warning in addition to the warnings in #31299 (comment)?

No, this will change the list to tuple before calling ndarray.__getitem__

Will need a whatsnew note.

updated

@jreback jreback added this to the 1.1 milestone Feb 9, 2020
@jreback jreback merged commit 04e9a78 into pandas-dev:master Feb 9, 2020
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jreback commented Feb 9, 2020

thanks, can you add to the deprecation issue (do this for anything we are deprecating).

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DEPR: disallow series[[slice(...)]]
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