CodeSkulptor 
"""
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"""
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Welcome to Codeskulptor's visualization mode (Viz mode)!
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Viz mode runs in Chrome, Firefox or Safari
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Click the wrench button above to active Viz mode, then
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click the triangle button to visualize the execution of
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the demo program
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"""
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def list_minimum(numbers):
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    """
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    Compute the minimum of a list of numbers
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    """
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    min_num = float("inf")
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    for num in numbers:
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        if num < min_num:
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            min_num = num  # Set breakpoint on this line
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    return min_num
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example_list = [4.6, 5.9, 2.1, 5.7, 1.1, 8.3]
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print "An example list is", example_list
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print
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minimum_number = list_minimum(example_list)
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print "The minimum of this example list is", minimum_number
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# The light blue bars in the code editor and console
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# indicate the current active line/event.
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# Navigate the execution trace of your program using
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# the next/prev statement buttons.
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# Click a line number to set a breakpoint for a line
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# Navigate between execution trace breakpoints using
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# the next/prev breakpoint/event buttons
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CodeSkulptor was built by Scott Rixner and is based upon CodeMirror and Skulpt. Viz mode was built by Terry Tang and utilizes Online Python Tutor's visualization code.