Random String Generator

random_string.py

import string
import random


# The random module also provides the SystemRandom class which uses the system function
# os.urandom() to generate random numbers from sources provided by the operating system.
os_random = random.SystemRandom()
default_characters = string.ascii_letters + string.digits  # 62 characters


def random_string(length=12, characters=default_characters):
    """Return a random string by randomly picking `length` characters
    from `characters`. The number of options is `len(characters) ** length`.
    For `length = 10` and `characters=default_characters` (62 characters),
    there are 839,299,365,868,340,224 options."""
    return "".join([os_random.choice(characters) for _ in range(length)])