python高强度密码生成器

一个python高强度密码生成器，可以指定要生成的密码长度

from os import urandom
from random import choice
 
char_set = {'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()
 

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