how to find substring in a string in python3 code example

Example 1: python get a substring of a string

>>> x = "Hello World!"
>>> x[2:]
'llo World!'
>>> x[:2]
'He'
>>> x[:-2]
'Hello Worl'
>>> x[-2:]
'd!'
>>> x[2:-2]
'llo Worl'

Example 2: Find substring into a string - Python

if "blah" in somestring: 
    continue