利用python暴力破解压缩文件密码

import random
import sys
import zipfile
import time
from threading import Thread
from multiprocessing import Process

class MyIterator:
    # letters = '0123456789abcdefghijklmnopqrstuvwxyz'
    letters = '1234zjcv'
    min_dig = 0
    max_dig = 0

    def __init__(self, min_dig, max_dig):

        if min_dig < max_dig:
            self.min_dig = min_dig
            self.max_dig = max_dig

        else:
            self.min_dig = max_dig
            self.max_dig = min_dig

    def __iter__(self):
        return self

    def __next__(self):
        rst = str()
        for item in range(0,random.randrange(self.min_dig,self.max_dig+1)):
            rst += random.choice(MyIterator.letters)
        return rst

def extract():
    start_time = time.time()
    zfile = zipfile.ZipFile('123.zip')

    for p in MyIterator(4, 6):
        print(p)
        try:
            zfile.extractall(path='.', pwd=str(p).encode('utf-8'))
            print('文件密码为：{}'.format(p))

            now_time = time.time()
            print('破解用时：{}'.format(now_time - start_time))
            sys.exit()

        except Exception as e:
            pass

if __name__ == '__main__':
    tl = Thread(target=extract)
    tl.start()
    tl.join()