python高強度密碼生成器

一個python高強度密碼生成器，可以指定要生成的密碼長度

from os import urandom
from random import choice

charset = {'small': 'abcdefghijklmnopqrstuvwxyz',
             'nums': '0123456789',
             'big': 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
             'special': '^!\$%&/()=?{[]}+~#-.:,;<>|\'
            }
def generate_pass(length=21):
    """Function to generate a password"""

password = []

while len(password) < length:
    key = choice(char_set.keys())
    a_char = urandom(1)
    if a_char in char_set[key]:
        if check_prev_char(password, char_set[key]):
            continue
        else:
            password.append(a_char)
return ''.join(password)



def check_prev_char(password, current_char_set):
    """Function to ensure that there are no consecutive
    UPPERCASE/lowercase/numbers/special-characters."""

index = len(password)
if index == 0:
    return False
else:
    prev_char = password[index - 1]
    if prev_char in current_char_set:
        return True
    else:
        return False


if name == 'main':
    print generate_pass()
 </pre>