python how to check if string contains code example

Example 1: python string contains

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

Example 2: python check if string in string

if "blah" not in somestring: 
    continue

Example 3: python check if value in string

def is_value_in_string(value: str, the_string: str):
    return value in the_string.lower()