Pandas API add date_format to read_csv

From https://github.com/pandas-dev/pandas/issues/2586

Currently, once can to

read_csv(path, parse_dates=True, date_parser=lambda x: to_datetime(x, format=fmt)

and the suggestion is to add a date_format argument such that you could do

read_csv(path, parse_dates=True, date_format=fmt)

and have it do the same thing

Comment From: luke396

take

Comment From: MarcoGorelli

wait, this needs discussion

Comment From: luke396

There is something wrong, when

data = """a,b
27.03.2003 14:55:00.000,1
03.08.2003 15:20:00.000,2"""
fmt = "%d.%m.%Y %H:%M:%S.%f"
pd.read_csv(io.StringIO(data),
            index_col=0, 
            date_parser=lambda x: pd.to_datetime(x, fmt), 
            parse_dates=True,
            )

That will raise an AssertionError, but maybe because of my own problems, may be it has nothing with this issue. I just want to point it.

Comment From: MarcoGorelli

please wait, this needs discussion about whether or not this keyword needs adding

Comment From: MarcoGorelli

closing in favour of https://github.com/pandas-dev/pandas/issues/50601