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Raising for invalid dtype issue #15520 #15576

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Raising for invalid dtype issue #15520 #15576

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6 changes: 6 additions & 0 deletions pandas/core/generic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,12 @@ def _validate_dtype(self, dtype):
raise NotImplementedError("compound dtypes are not implemented"
"in the {0} constructor"
.format(self.__class__.__name__))

# check if coerced dtype is of type object
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use pandas.types.common.pandas_dtype

if dtype.kind == 'O':
raise TypeError("argument 'dtype' must be a valid "
"pandas/numpy dtype")

return dtype

def _init_mgr(self, mgr, axes=None, dtype=None, copy=False):
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