ENH/BUG: str.extractall doesn't support index

[sinhrks]

• closes ENH: Index StringMethods should return MultiIndex when result dimension is more than one #10008
• tests added / passed
• passes git diff upstream/master | flake8 --diff
• whatsnew entry

# same output as pd.Series(["a1a2", "b1", "c1"]).str.extractall("[ab](?P<digit>\d)") idx = pd.Index(["a1a2", "b1", "c1"]) idx.str.extractall("[ab](?P<digit>\d)") # digit # match #0 0 1 # 1 2 #1 0 1 

NOTE Also fixed a bug Series.str.extractall raises ValueError if its Index is str with 2 or more characters.

s = pd.Series(["a1a2", "b1", "c1"], index=pd.Index(["xx", "yy", "zz"])) s.str.extractall("[ab](?P<digit>\d)") # ValueError: Length of names must match number of levels in MultiIndex. 

[sinhrks]

CC: @tdhock

[jreback]

a DataFrame

a Series.str.extractall

with a default index

[sinhrks]

Thanks, fixed these.

[jreback]

thanks @sinhrks very nice!