Pythons Standard Library

import string

string.ascii_letters

## 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

string.ascii_uppercase

## 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

string.ascii_lowercase

## 'abcdefghijklmnopqrstuvwxyz'

string.digits

## '0123456789'

string.hexdigits

## '0123456789abcdefABCDEF'

string.octdigits

## '01234567'

string.punctuation

## '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

string.printable

## '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c'

string.whitespace

## ' \t\n\r\x0b\x0c'