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BUG: MultiIndex.dtypes index behavior changes after 1.4.x #46900

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Yikun opened this issue Apr 30, 2022 · 4 comments · Fixed by #47349
Closed
3 tasks done

BUG: MultiIndex.dtypes index behavior changes after 1.4.x #46900

Yikun opened this issue Apr 30, 2022 · 4 comments · Fixed by #47349
Labels
Bug Dtype Conversions Unexpected or buggy dtype conversions MultiIndex Regression Functionality that used to work in a prior pandas version
Milestone
1.4.3

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@Yikun
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Yikun commented Apr 30, 2022 •
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Pandas version checks

  • I have checked that this issue has not already been reported.

  • I have confirmed this bug exists on the latest version of pandas.

  • I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

After 1.4.x:

arrays​ ​=​ [[​1​, ​1​, ​2​, ​2​], [​"red"​, ​"blue"​, ​"red"​, ​"blue"​]]
pmidx = pd.MultiIndex.from_arrays(arrays, names=[("zero", "first"), ("one", "second")])
>>> pmidx.dtypes.index
Index([('zero', 'first'), ('one', 'second')], dtype='object')

Issue Description

dtypes index behavior changes.

Expected Behavior

pmidx = pd.MultiIndex.from_arrays(arrays, names=[("zero", "first"), ("one", "second")])
>>> pmidx.dtypes.index
MultiIndex([('zero',  'first'),
            ( 'one', 'second')],
           )

Installed Versions

pandas 1.4.2
@Yikun Yikun added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Apr 30, 2022
@Yikun
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Yikun commented Apr 30, 2022

d06fb91

cc @johnzangwill

@Yikun Yikun mentioned this issue Apr 30, 2022
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@rhshadrach
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Thanks for the report - can you add the values of arrays to your example in the OP.

@rhshadrach rhshadrach added Dtype Conversions Unexpected or buggy dtype conversions MultiIndex Needs Info Clarification about behavior needed to assess issue labels Apr 30, 2022
@Yikun
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Yikun commented May 1, 2022

@rhshadrach Sorry before, added.

@simonjayhawkins
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d06fb91

xref #45175

@simonjayhawkins simonjayhawkins added Regression Functionality that used to work in a prior pandas version and removed Needs Info Clarification about behavior needed to assess issue Needs Triage Issue that has not been reviewed by a pandas team member labels May 4, 2022
@simonjayhawkins simonjayhawkins added this to the 1.4.3 milestone May 4, 2022
simonjayhawkins added a commit to simonjayhawkins/pandas that referenced this issue May 4, 2022
@simonjayhawkins
code sample for pandas-dev#46900
8853ad2
@phofl phofl mentioned this issue Jun 14, 2022
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Labels
Bug Dtype Conversions Unexpected or buggy dtype conversions MultiIndex Regression Functionality that used to work in a prior pandas version
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Milestone
1.4.3
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REGR: MultiIndex.dtypes has regular Index instead of MultiIndex index phofl/pandas
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@Yikun @simonjayhawkins @rhshadrach