题解 | #密码验证合格程序#

def checkpsw(psw):
    #1密码长度大于8
    if len(psw)<=8: return False
    else:
        #2最大重复子串长度2+
        sub = []
        for i in range(len(psw)-2):
            sub.append(psw[i:i+3]) #一次取两个，加入列表中
        if len(set(sub)) < len(sub):return False #利用set的无重复的性质，如果存在重复，肯定长度变小
        #3查看数字类型
        type_ = 0
        import re #引入正则表达式
        Upper = '[A-Z]'
        Lowwer = '[a-z]'
        num = '\d'
        chars = '[^A-Za-z0-9_]'
        patterns = [Upper, Lowwer, num, chars]
        for pattern in patterns:
            pw = re.search(pattern, psw)  #在psw中查找相关字段，re.reserch(pattern, string, flags=0)
            if pw : type_ += 1
        return True if type_ >= 3 else False
                       
            
    
while True:
    try:
        psw = input()
        print('OK' if checkpsw(psw) else 'NG')
    except:
        break