密码验证合格程序python3

import sys

class CheckPasswd():
    def __init__(self, passwd):
        self.passwd = passwd
        self.type_counter = 0
        self.child_str = False

    def check_type(self):  #检查类型是否多于等于3
        type_set = set()
        for i in self.passwd:
            if i.isdigit():  #是否有数字
                type_set.add(1)
            elif i.isalpha():  #是否有字母
                if i.lower() == i:
                    type_set.add(2)
                else:
                    type_set.add(3)
            else:
                type_set.add(4)

        self.type_counter = len(type_set)

    def check_child(self):  #检查是否有重复子串
        for i in range(len(self.passwd)-3):
            if self.passwd.count(self.passwd[i:i+3]) > 1:
                self.child_str = True
                break  #这里一检查到有重复子串，就break，不然一直遍历，最后的结果可能为False
            else:
                self.child_str = False  

    def run_check(self):
        if len(self.passwd) <= 8:
            return 'NG'

        self.check_type()
        if self.type_counter < 3:
            return 'NG'

        self.check_child()
        if self.child_str:
            return 'NG'

        return 'OK'

def main():
    while True:
        passwd = sys.stdin.readline().strip()
        if passwd == '':
            break

        check_instance = CheckPasswd(passwd)
        print(check_instance.run_check())

main()