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    <p><strike>I think that, since you are declaring the <code>isPrime</code> global variable after the definition of <code>primeTest()</code>, the Python interpreter treats the isPrime within the function as a local variable.</strike></p> <p>I was mistaken.. you have to declare it as <code>global isPrime</code> from within the function. Order of declaration (function or variable first) doesn't matter. Something like this:</p> <pre><code>def primeTest(): global isPrime isPrime = False isPrime = True print isPrime # returns True primeTest() print isPrime # returns False </code></pre> <p>Note that you cannot write <code>global isPrime = False</code>; it must be two statements.</p> <p>Anyway, it is rather bad practice to be changing global variables like that. <strike>Why don't you pass <code>isPrime</code> as an argument to <code>primeTest()</code>?</strike></p> <p><b>Edit:</b></p> <p>Okay, my answer was <em>still</em> too hasty. Simply passing isPrime as an argument doesn't work, because boolean values are immutable types. The best way to handle your current problem is to have <code>isPrime</code> as a return value:</p> <pre><code>def primeTest(testnum): ... do your calculations here, set a variable ret_val to True or False ... return ret_val </code></pre> <p>Now you can do <code>isPrime = primeTest(10)</code> to find out if any number is a prime.</p> <p>However, if you pass your function a mutable type (like a list), you can modify it from within the function. <a href="https://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference">This post covers it quite well.</a> But you needn't concern yourself with that just yet.</p>
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    1. COAh, I didn't notice that you suggested passing isPrime as an argument as well, once I pass it in when the function completes will the isPrime be updated? Also, thank you very much for the help.
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