import string
assert string.ascii_letters == 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
assert string.ascii_lowercase == 'abcdefghijklmnopqrstuvwxyz'
assert string.ascii_uppercase == 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
assert string.digits == '0123456789'
assert string.hexdigits == '0123456789abcdefABCDEF'
assert string.octdigits == '01234567'
assert string.punctuation == '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'
assert string.capwords('bla bla', ' ') == 'Bla Bla'
from string import Template
s = Template('$who likes $what')
from string import Formatter
f = Formatter()