how to insert varibale in a varibale in python code example

Example 1: embed variables python

#Pre 3.6
print('Hi, my name is {name} and my age is {age}'.format(**locals()))

#After 3.6
print('Hi, my name is {name} and my age is {age}')

Example 2: how to add a variable to an string

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