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Now that we have Python installed, what's this interactive shell thing we're running?
It's like this: Python leads a double life. It is both an interpreter for scripts that you can run -- either from the command line, or by double-clicking on scripts and running them like applications. But it is also an interactive shell that can evaluate arbitrary statements and expressions. This is extremely useful for debugging, quick hacking, and testing. I even know some people who use the Python interactive shell in lieu of a calculator!
Launch the Python interactive shell in whatever way works on your platform, and let's dive in.
>>> 1 + 12 >>> print 'hello world'
hello world >>> x = 1
>>> y = 2 >>> x + y 3
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