is there any difference in IDLE and IDLE 3?

DougieLawson wrote:You're using python2 syntax with python3.

Start here: http://docs.python-guide.org/en/latest/intro/learning/

How do i fix this? Where do I get the download?

Python 3.2.3 (default, Mar 1 2013, 11:53:50)
[GCC 4.6.3] on linux2
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>>> #!/usr/bin/env python
>>> print "hello world" last quotetation is highlighted
SyntaxError: invalid syntax
>>>

I keep getting the same syntax error "Phython 3.2.3 ...." and the 3.2.3 is highlighted.
What should I do?