利用Python判断你的密码难度等级

def level():
     def number(password):  # 判断数字
         number = False
         for c in password:
             if c.isnumeric():
                 number = True
                 break
         return number
     def islower(password):  # 小写
         islower = False
         for c in password:
             if c.islower():
                 islower = True
                 break
         return islower
     def isupper(password):  # 大写
         isupper = False
         for c in password:
             if c.isupper():
                 isupper = True
                 break
         return isupper
     def string(password):  # 标点
         str=(',.:;*@$%^&!')
         string = False
         for c in password:
             if c in str:
                 string = True
                 break
         return string
     password = input('请输入密码：')
     # 密码强度，初始化为0
     strength_level = 0
     a=len(password)//6
     strength_level += a
     if number(password):
         strength_level += 1
     if islower(password):
         strength_level += 1
     if isupper(password):
         strength_level += 1
     if str(password):
         strength_level += 1
         print("您的密码强度为{}".format(strength_level))
 print(level())