check if string is character python code example

Example 1: how to check if all characters in string are same python

s == len(s) * s[0]

Example 2: python check if character is letter

>>> 'A'.isalpha()
True
>>> '1'.isalpha()
False

Example 3: python check if string contains one of characters list

if any(ext in url_string for ext in extensionsToCheck):
    print(url_string)