Inplace translation of pandas.Series after PDEP-6

[rsundqvist]

Description

After PDEP-6, assigning values incompatible with the current dtype will require explicit an type conversion.

This will break inplace translation, since Series.astype returns a new object. It (should?) keep working for DataFrame, as in that case we simply replace the entire column.

Possible solution

Detect if pandas.Series is compatible with strings. If not, raise NotInplaceTranslatableError if inplace=True.

def series_inplace_translatable() -> bool:
    try:
        pd.Series(dtype=int)[:] = ""
    except ExceptionType:
        raise NotInplaceTranslatableError

The exact exception type that will be raised is not known yet.