8000 MAINT: Fix broadcasting of arrays by bashtage · Pull Request #35485 · pandas-dev/pandas · GitHub
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MAINT: Fix broadcasting of arrays #35485

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MAINT: Fix broadcasting of arrays #35485

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MAINT: Fix broadcasting of arrays 
Prevent empty object arrays from being broadcast
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@bashtage
bashtage authored and Kevin Sheppard committed Aug 2, 2020
commit b439dfc88f66eb64a0529d5030b026ac6e6cbd7c
7 changes: 5 additions & 2 deletions pandas/core/internals/construction.py
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Expand Up @@ -266,8 +266,11 @@ def init_dict(data: Dict, index, columns, dtype: Optional[DtypeObj] = None):
else:
nan_dtype = dtype
val = construct_1d_arraylike_from_scalar(np.nan, len(index), nan_dtype)
arrays.loc[missing] = [val] * missing.sum()

if val.size == 0:
for iloc in np.where(missing)[0]:
arrays.iloc[iloc] = val
else:
arrays.loc[missing] = [val] * missing.sum()
else:
keys = list(data.keys())
columns = data_names = Index(keys)
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