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Start the interpreter on the command line by entering python at the shell prompt.
GNU/Linux and BSD users who have installed Python 3.x alongside Python 2.x may have to start the Python 3.x interpreter by entering python3 at the shell prompt.
For Windows users, you can run the interpreter in the command line if you have set the PATH variable appropriately. In order to open the command line in Windows, open the start menu and click 'Run'. In the dialog box, type 'cmd' and press enter; you now have everything you need to get started with python in the DOS prompt.
If you are using IDLE, click on Start → Programs → Python 3.0 → IDLE (Python GUI).
Now enter print('Hello World') followed by the Enter key. You should see the words Hello World as output.
Python 3.2.2 (default, Sep 14 2011, 09:07:29) [MSC v.1500 64 bit (AMD64)] on win32
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>>> print('Hello World')
Notice that Python gives you the output of the line immediately! What you just entered is a single Python statement. We use print to (unsurprisingly) print any value that you supply to it. Here, we are supplying the text Hello World and this is promptly printed to the screen.