What is the main diffrens between python 2 and python 3?

Answer 1

some differences:

2.7
print "hello"

3
print("hello")

2.7
import Tkinter

3
import tkinter

and many different way to import the same modules that are in different location in the 3rd version

Many modules were made for the version 2 and they are now migrating towards version 3

Answer 2

you can find detail about differene on their website.. www.python.org