#!/usr/bin/python3
########################################################################
# Displaying the location of variable
# Before and after a change
########################################################################
print("Content-Type: text/html  \n")                #required
print('<pre>')                                      #enhance display for the web

num = 123
print( F"{num} \t {id(num)} \t {id(num):x} ")       #print ref in decimal and hexadecimal
num = 567
print( F"{num} \t {id(num)} \t {id(num):x} ")
print()

str = 'abc'
print( F"{str} \t {id(str)} \t {id(str):x} ")
str = 'xyz'
print( F"{str} \t {id(str)} \t {id(str):x} ")