mypy issue when value of the dict passed to from_dict() are scalars

[johanvergeer]

When a scalar value is used in the dict that is passed to from_dict(), then mypy will raise an error, while Pandas can handle this input just fine.

>>> import pandas as pd
>>> data = {"a": 1, "b": 2}
>>> dataframe = pd.DataFrame.from_dict(data, orient="index", columns=["foo"])
>>> dataframe
   foo
a    1
b    2

Would it be better to change the stubs for from_dict() to also allow scalars?

I did have a look at the pandas._typing module, which contains some definitions for scalars, but that doesn't seem to include numpy types.

PythonScalar = Union[str, int, float, bool]
PandasScalar = Union["Period", "Timestamp", "Timedelta", "Interval"]
Scalar = Union[PythonScalar, PandasScalar]

[zkrolikowski-vl]

pandas-stubs has moved to a new repository and will now be managed alongside pandas itself: https://github.com/pandas-dev/pandas-stubs

You might try using the newest version pip install pandas-stubs==1.4.2.220626 which comes from that repository. If it doesn't work please considering opening an issue in the new repository.