Random string generation with upper case letters and digits

Question

I want to generate a string of size N.

It should be made up of numbers and uppercase English letters such as:

• 6U1S75
• 4Z4UKK
• U911K4

Answer 1

If you need a random string rather than a pseudo random one, you should use os.urandom as the source

from os import urandom
from itertools import islice, imap, repeat
import string

def rand_string(length=5):
    chars = set(string.ascii_uppercase + string.digits)
    char_gen = (c for c in imap(urandom, repeat(1)) if c in chars)
    return ''.join(islice(char_gen, None, length))