how to find if a string exists python code example

Example 1: if substring not in string python

fullstring = "StackAbuse"
substring = "tack"

if fullstring.find(substring) != -1:
    print "Found!"
else:
    print "Not found!"

Example 2: python check if value in string

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