Python如何检查输入是否仅包含某些字符？

Question

I am trying to get my code to check if a user input only contains the following characters: "!$%^&*()_-+="

If it contains any other characters then points should be subtracted. I tried this but it doesn't work properly:

if "a-z" not in password and "A-Z" not in password and "0-9" not in password:
    points = points - 1

How can I fix this?

Thank you

Answer 1

You can use use a regular expression by escaping the characters you listed above:

import re
s = "_%&&^$"
if not re.findall("^[\!\$\%\^\&\*\(\)\_\-\+\=]+$", s):
    points -= 1

Answer 2

I would use regex.

import re
if not (re.compile("[\"\!\$\%\^\&\*\(\)_\-\+=\"]+").match(s)): #Subtract points

Answer 3

As others have said you can use regex. A generator expression like this works too:

points -= sum(1 for x in password if x not in '!$%^&*()_-+=')