how to check if string has a character in python code example

Example 1: python check if character is letter

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

Example 2: python check if string in string

if "blah" not in somestring: 
    continue

Example 3: check if string contains python

>>> str = "Messi is the best soccer player"
>>> "soccer" in str
True
>>> "football" in str
False