string.ascii_letters

• The concatenation of the ascii_lowercase and ascii_uppercase constants described below. This value is not locale-dependent.

string.ascii_lowercase

• The lowercase letters abcdefghijklmnopqrstuvwxyz. This value is not locale-dependent and will not change.

string.ascii_uppercase

• The uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ. This value is not locale-dependent and will not change.

string.digits

• The string 0123456789.

string.hexdigits

• The string 0123456789abcdefABCDEF.

string.octdigits The string 01234567.

string.punctuation

• String of ASCII characters which are considered punctuation characters in the C locale: !"#$%&'()*+,-./:;<=>?@[\]^_{|}~