Running Python 3.3.0 on Ubuntu 12.10 (print error)

Question

Possible Duplicate:
Python 3 error when running the print command

I installed Python 3.3.0 on Ubuntu 12.10(x64)and when I type print 'hello world' it brings syntax error.

But when I type that in Python 2.7.3 the code works.

Why is it happening?