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Fix zillion deprecation warnings in core.dtypes.common #22142

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Merged
jreback merged 3 commits into from
Aug 1, 2018
Merged

Fix zillion deprecation warnings in core.dtypes.common #22142

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a332a16
fix zillion deprecation warnings
jbrockmendel Jul 31, 2018
250bb6c
whitespace fixup
jbrockmendel Jul 31, 2018
5d14359
fix py3 hashable nameerror
jbrockmendel Jul 31, 2018
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4 changes: 3 additions & 1 deletion pandas/core/dtypes/common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2023,7 +2023,9 @@ def pandas_dtype(dtype):
# also catch some valid dtypes such as object, np.object_ and 'object'
# which we safeguard against by catching them earlier and returning
# np.dtype(valid_dtype) before this condition is evaluated.
if dtype in [object, np.object_, 'object', 'O']:
if is_hashable(dtype) and dtype in [object, np.object_, 'object', 'O']:
# check hashability to avoid errors/DeprecationWarning when we get
# here and `dtype` is an array
return npdtype
elif npdtype.kind == 'O':
raise TypeError("dtype '{}' not understood".format(dtype))
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