GH1203 Pass a dict to setter for DataFrame.loc/iloc

[loicdiridollou]

• Closes __setitem__ should accept a dictionary #1203
• Tests added: Please use assert_type() to assert the type of any return value

[Dr-Irv]

I would like to see if we could not just use a generic dict here. We would not want to allow something like df.loc[0] =df.loc[0] = {"X": pd.Series([1,2,3])} Maybe Mapping[Hashable, Scalar | NAType | NaTType) would be a better type.

[loicdiridollou]

Indeed that will be a bit more restrictive and avoid weird inputs.

[Dr-Irv]

thanks @loicdiridollou