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    <p>It's better to use a <code>while</code>-loop to control the repetition, rather than a <code>for</code>-loop. This way the users aren't limited to a fixed number of repeats, <em>they can continue as long as they want</em>. In order to quit, users enter a value &lt;= 0.</p> <pre><code>from __future__ import division import math function = int(raw_input("Type function no.: ")) while function &gt; 0: if function == 1: a = float(raw_input ("Enter average speed: ")) b = float(raw_input ("Enter length of path: ")) answer = b/a print "Answer=", float(answer), elif function == 2: mass_kg = int(input("What is your mass in kilograms?" )) mass_stone = mass_kg * 2.2 / 14 print "You weigh", mass_stone, "stone." print 'Enter a value &lt;= 0 for function number to quit.' function = int(raw_input("Type function no.: ")) </code></pre> <p>You can tweak this (e.g., the termination condition) as needed. For instance you could specify that 0 be the only termination value etc.</p> <p><em><strong>An alternative</em></strong> is a loop that runs "forever", and break if a specific function number is provided (in this example <code>0</code>). Here's a skeleton/sketch of this approach:</p> <pre><code> function = int(raw_input("Type function no.: ")) while True: if function == 1: ... elif function == 2: ... elif function == 0: break # terminate the loop. print 'Enter 0 for function number to quit.' function = int(raw_input("Type function no.: ")) </code></pre> <p><em>Note</em>: A <code>for</code>-loop is most appropriate if you are <strong>iterating a known/fixed number of times</strong>, for instance over a sequence (like a list), or if you want to limit the repeats in some way. In order to give your users more flexibility a <code>while</code>-loop is a better approach here.</p>
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    1. POIntegrating a for loop into an if statement
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    1. COThanks a lot for the answer! I'll look into the while. Thanks for the skeleton. :)
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    2. CO@Downvoter .. A downvote ***without*** explanation is not useful to *anyone* (OP, SO, or me) .. the code was tested and meets OPs requirements. If not, I am happy to correct errors or improve my answer but that requires some *constructive* feedback.
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    3. COThere's a slight DRY violation w.r.t. `raw_input` here. I tend to prefer the `while True/input/break` pattern to avoid this.
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