python md5 python MD5解密

import hashlib

with open('md5.txt', 'w') as f:
    print('正在写入。。。')
    for i in range(0, 999999):
        md5 = hashlib.md5(str(i).encode()).hexdigest() + '\n'

        f.write(md5)
    print('写入完成。')

def md5decrypt(num: str):
    with open('md5.txt', 'r') as f:
        result = 0
        for line in f:
            line = line.split('\n')
            if num == line[0]:
                print('解密成功，密文为：', result)
                return result
            else:
                result += 1
        print('解密失败！')
        return None

if __name__ == '__main__':
    r = md5decrypt('d3e4029427aa766ffa42fd454b28d3b4')
    if r:
        print('解密成功：', r)
    else:
        print('解密失败！')