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BUG: MultiIndex.putmask #43212

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jbrockmendel opened this issue Aug 25, 2021 · 1 comment · Fixed by #43219
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BUG: MultiIndex.putmask #43212

jbrockmendel opened this issue Aug 25, 2021 · 1 comment · Fixed by #43219
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Bug MultiIndex
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1.4

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@jbrockmendel
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left = pd.MultiIndex.from_tuples([(np.nan, 6), (np.nan, 6), ("a", 4)])
right = pd.MultiIndex.from_tuples([("a", 1), ("a", 1), ("d", 1)])
mask = np.array([True, True, False])

result = left.putmask(mask, right)
>>> result
[...]
IndexError: list index out of range

The result here somehow ended up with len(result.levels) == 0
@jbrockmendel jbrockmendel added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Aug 25, 2021
@simonjayhawkins
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on 1.2.5 this raises TypeError: Expected tuple, got MultiIndex

@simonjayhawkins simonjayhawkins added MultiIndex and removed Needs Triage Issue that has not been reviewed by a pandas team member labels Aug 25, 2021
@jbrockmendel jbrockmendel mentioned this issue Aug 25, 2021
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@jreback jreback added this to the 1.4 milestone Aug 30, 2021
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BUG: MultiIndex.putmask jbrockmendel/pandas
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@jreback @jbrockmendel @simonjayhawkins