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"""A simple interactive demo to illustrate the use of IPython's Demo class.
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Any python script can be run as a demo, but that does little more than showing
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it on-screen, syntax-highlighted in one shot. If you add a little simple
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markup, you can stop at specified intervals and return to the ipython prompt,
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resuming execution later.
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"""
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print 'Hello, welcome to an interactive IPython demo.'
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print 'Executing this block should require confirmation before proceeding,'
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print 'unless auto_all has been set to true in the demo object'
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# The mark below defines a block boundary, which is a point where IPython will
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# stop execution and return to the interactive prompt.
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# Note that in actual interactive execution,
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# <demo> --- stop ---
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x = 1
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y = 2
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# <demo> --- stop ---
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# the mark below makes this block as silent
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# <demo> silent
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print 'This is a silent block, which gets executed but not printed.'
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# <demo> --- stop ---
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# <demo> auto
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print 'This is an automatic block.'
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print 'It is executed without asking for confirmation, but printed.'
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z = x+y
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print 'z=',x
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# <demo> --- stop ---
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# This is just another normal block.
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print 'z is now:', z
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print 'bye!'
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