Which book or website should I refer for the practice of python ?

Answer 1

For Dummies series are insanely hilarious and knowledge building. Give it a try!

Answer 2

http://www.inventwithpython.com or get anyone of the books if you want to read offline and practice they really help and are fun and interactive.

Answer 3

learnpythonthehardway is good
and you can also use tutorialspoint.com it is also very good site it provides video tutorials also...

Answer 4

you can start by checking out the python manual here https://docs.python.org/3/tutorial/index.html

Answer 5

also for practise, although you may already know about it, this http://www.practicepython.org