python check if string is in a sentence code example

Example 1: how to check if there is a word in a string in python

>>> 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 string contains substring

string = "My favourite programming language is Python"
substring = "Python"

if substring in string:
    print("Python is my favorite language")
elif substring not in string:
    print("Python is not my favourite language")