rstr.py

import random
def rstr(length=5, special_chars=True, numbers=True, upper_case=True):
    chars = string.ascii_lowercase
    chars += string.ascii_uppercase if upper_case else ''
    chars += string.digits if numbers else ''
    chars += string.punctuation if special_chars else ''
    return ''.join(random.choice(chars) for i in range(length))