The find(), index(), upper(), lower(), len(), and count() methods

The find() function is used to search for a character or string within our target string. This function returns the first index of the string if a match is found. It returns -1 if it does not find the match:

The index() method is identical to the find() method. It returns the first index of the string if it finds the match and raises an exception if it does not find a match:

The upper() method is used to transform the input string to upper case letters and the lower() method is used to transform a given string to lowercase letters:

The len() method returns the length of the given string:

The count() method returns the number of occurrences of any character or string that we wish to count within the target string: