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    <p>Although it may seem like your functions don't return anything, they do in fact. Quoting <a href="http://docs.python.org/tutorial/controlflow.html#defining-functions" rel="nofollow">the Python.org documentation</a>:</p> <blockquote> <p>The return statement returns with a value from a function. return without an expression argument returns None. Falling off the end of a function also returns None.</p> </blockquote> <p>So your functions really look like this:</p> <pre><code>def pants(): print "Put on some pants!" return None def shorts(): print "And don't forget your underwear!" return None </code></pre> <p>Your assignments assign to <code>zap</code> whatever <code>pants</code> returns (i.e. the value of <code>pants()</code>), and to <code>thing</code> whatever <code>shorts</code> returns. In your case, both are <code>None</code>, but of course the functions must be run in order to figure this out(*). Afterall, it could be that <code>pants</code> returns <code>42</code> during leap years, and that <code>shorts</code> returns <code>'Foobar'</code> whenever some random number generator "rolls" a 6.</p> <hr> <p>(*) Digression: That the functions "must be run" should not be considered universally true. In a <a href="https://en.wikipedia.org/wiki/Pure_function" rel="nofollow">pure setting</a>, and leaving aside the specifics of Python (of which I know very little), a compiler might realize that both functions are identically <code>None</code>, and cause no calls to be made when the program is run. But a function that prints something (or inspects whether the current year is a leap year, or rolls a die) won't be pure.</p>
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