how to check if a string contains specific characters in python code example

Example 1: python string contains substring

fullstring = "StackAbuse"
substring = "tack"

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

Example 2: python if string contains char

myString = "<text contains this>"
myOtherString = "AnotherString"

# Casting to string is not needed but it's good practice
# to check for errors 

if str(myString) in str(myOtherString): 
    # Do Something
else:
	# myOtherString didn't contain myString

Example 3: python check if value in string

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

Example 4: python check if string contains one of characters list

if any(ext in url_string for ext in extensionsToCheck):
    print(url_string)