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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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from __future__ import print_function
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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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