python之检查字符串是否只包含一些值，而不包含其他值

print("Hello, welcome to password strength. Test how strong your password is todai!") 
password = input("Well enter a password why don't you... ") 
print("So your password is", password) 
print("Well ok, let's see what i can understand from this...") 
 
if len(password) < 6:    
    print("Your password is too short")     
else:     
    print("Your password is of a good length")     
 
if password == password.upper():     
    print("Your password has too many uppercase letters") 
else:     
    print("Your password has 0 or a couple upper case letters, please consider making your password remember-able.") 
 
if password == password.lower():     
    print("Your password needs a upper case letter case letters") 
else:     
    print("Your password has a suitable amount of lowercase vs upper case letters") 
 
if password ==  

这是我想问密码是否只包含数字的地方，但我不知道该怎么做，我已经尝试过使用 ands 和 ors，但失败得很惨。

请您参考如下方法:

使用isdigit()

>>> "abcd123".isdigit() 
False 
 
>>> "123".isdigit() 
True