how to add a variable to a string in python code example

Example 1: insert into string python

>>> line = 'Kong Panda'
>>> index = line.find('Panda')
>>> output_line = line[:index] + 'Fu ' + line[index:]
>>> output_line
'Kong Fu Panda'

Example 2: how to add a variable to an string

var str = "ello";
var letter = "h";
str = letter + str;