The difference between python3.5 and python2.7

In Python 3.3.0, print has been used as a built-in function, which means that if you output, you need to do this: print("Hello, World! ") )), in Python 3.3.0, there must be no fewer parentheses after print. In Python 2.7.3, parentheses are not needed after printing. I think beginners should still learn Python 2.7.3, because ...