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BUG: DTA/TDA/PA/Series/Index.view with datetimelike #39788

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Merged
merged 8 commits into from
Feb 21, 2021

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jbrockmendel
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  • closes #xxxx
  • tests added / passed
  • Ensure all linting tests pass, see here for how to run them
  • whatsnew entry

This makes it feasible to share some of the SetitemCastingEquivalents tests.

@jbrockmendel jbrockmendel changed the title Bug dtlike view BUG: DTA/TDA/PA/Series/Index.view with datetimelike Feb 13, 2021
if isinstance(dtype, (np.dtype, ExtensionDtype)) and needs_i8_conversion(
dtype
):
if dtype.kind == "m" and dtype != "m8[ns]":
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you can handle all m and M types via this branch?

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L757-L759 is for non-nano td64. L754-L765 handles all td64, dt64, dt64tz, and perioddtype

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i think this could use a little more commentary here (similar to what you did on the datetimelike astype), pls catch in a followon

@jreback jreback added Dtype Conversions Unexpected or buggy dtype conversions Index Related to the Index class or subclasses labels Feb 15, 2021
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small comment, other lgtm.

if dtype is None or dtype is self.dtype:
return type(self)(self._ndarray, dtype=self.dtype)

if isinstance(dtype, type):
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i think make this clear that M8[ns] (or really M8[s]) or whatever will hit here, but a tz-aware / pandas dtype will pass thru. yes after i read it i get it, but in 3 months no-one will remember.

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fleshing out the comment bc its pretty weird. this line isnt catching np.dtype, its catching type, e.g. we get here with dtype=np.ndarray

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updated + green

@jreback jreback added this to the 1.3 milestone Feb 17, 2021
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comment for followon

if isinstance(dtype, (np.dtype, ExtensionDtype)) and needs_i8_conversion(
dtype
):
if dtype.kind == "m" and dtype != "m8[ns]":
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i think this could use a little more commentary here (similar to what you did on the datetimelike astype), pls catch in a followon

@jreback jreback merged commit 8d2a57e into pandas-dev:master Feb 21, 2021
@jbrockmendel jbrockmendel deleted the bug-dtlike-view branch February 21, 2021 17:26
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2 participants