1213. Exclamation marks series #1: Remove an exclamation mark from the end of string

Description:

Remove an exclamation mark from the end of a string. For a beginner kata, you can assume that the input data is always a string, no need to verify it.

Examples

remove("Hi!") == "Hi"
remove("Hi!!!") == "Hi!!"
remove("!Hi") == "!Hi"
remove("!Hi!") == "!Hi"
remove("Hi! Hi!") == "Hi! Hi"
remove("Hi") == "Hi"

Solution:

def remove(s):
    if a := s and s[-1] == "!": ...
    return a and s[:-a] or s