Answers for "python group name"

python named group regex example

>>> re.search(r'(?P<name>[^-]+)-(?P<ver>d.d.d-d+).tar.gz', 'package_name-1.2.3-2004.tar.gz').groupdict()
{'name': 'package_name', 'ver': '1.2.3-2004'}

re python3

import re
>>> m = re.search('(?<=abc)def', 'abcdef')
>>> m.group(0)
'def'

python group by

df.groupby('group').assign(mean_var1 = lambda x: np.mean(x.var1)