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copied!<p>The problem is here:</p> <pre><code>calculate_button = Button(text='Calculate', command=solfield()) </code></pre> <p>To pass the function <code>solfield</code> itself as the <code>command</code>, just use its name:</p> <pre><code>calculate_button = Button(text='Calculate', command=solfield) </code></pre> <p>What you're doing is <em>calling</em> the function, and then passing the return value of that function as the command.</p> <p>Since you defined <code>solfield</code> above as do-nothing function, that return value is <code>None</code>, so you're telling <code>calculate_button</code> that its <code>command=None</code>, and it's properly doing nothing.</p> <hr> <p>Meanwhile, as SethMMorton pointed out (but then deleted):</p> <blockquote> <p>You have two functions named <code>solfield</code>, and you are naming a variable <code>solfield</code> in one of your <code>solfield</code> functions. Remove the empty function (the one with pass), and using a different variable name in the remaining function.</p> </blockquote> <p>This isn't causing your actual problem, but it's certainly adding to the confusion that makes it harder for you to <em>find</em> the problem. (For example, if you hadn't included the excess empty definition of <code>solfield</code> at all, you would have gotten a <code>NameError</code> in the incorrect line, which would have made things easier to debug.)</p> <hr> <p>Putting it all together, what you should do is:</p> <ol> <li>Get rid of the empty (<code>pass</code>-only) definition of <code>solfield</code>.</li> <li>Move the real implementation of <code>solfield</code> up above the point where you build the GUI.</li> <li>Don't name a local variable <code>solfield</code> within the function.</li> <li>Pass just <code>solfield</code>, not <code>solfield()</code> as the <code>command</code> for <code>calculate_button</code>.</li> </ol>

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