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    <p>The problem is that you're calling <code>hello(i)</code> at the time of construction of the <code>Radiobutton</code>, not storing something to be called later:</p> <pre><code> c.append(Radiobutton(frameData, text=InputBox.get(i), variable=inputVar, value = i, background="grey", command= hello(i))) </code></pre> <p>Since <code>hello</code> returns <code>None</code>, you're effectively storing <code>command=None</code>.</p> <p>You need to store a callable here, like <code>hello</code> itself, (or a <code>lambda</code> or <code>partial</code>, or whatever), not the result of calling it.</p> <p>For example:</p> <pre><code> c.append(Radiobutton(frameData, text=InputBox.get(i), variable=inputVar, value = i, background="grey", command=functools.partial(hello, i))) </code></pre> <p>Since you asked in the comments: Note that I used <code>partial</code> rather than <code>lambda</code>, because I want to bind in the value of <code>i</code>, not close over the variable <code>i</code>. Otherwise, you'd end up with, e.g., 5 radio buttons all bound to the same variable <code>i</code> with the value <code>4</code>. There are other ways around this—use an explicit factory, do <code>lambda x=i: hello(x)</code> instead of <code>lambda: hello(i)</code>, etc. To me, <code>partial</code> seems like the clearest and most explicit, but your mileage may vary. Anyway, there are dozens of questions on SO about this, but the answer to <a href="https://stackoverflow.com/questions/938429/scope-of-python-lambda-functions-and-their-parameters">Scope of python lambda functions and their parameters</a> seems particularly clear.</p>
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    1. POPython: Assign a function to a dynamically created radio button
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    1. COYes, because you're creating a lambda for each `Radiobutton` that all close over the same `i` variable. There are dozens of SO questions about that, like [this one](http://stackoverflow.com/questions/938429/scope-of-python-lambda-functions-and-their-parameters), which will show you how to do the right thing.
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    2. COThank you for that. But now the problem is that how do I know which radio button is clicked? i.e. now it's printing the last updated value of i whenever any button is clicked.
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    3. COThank you. I'll have a look at it. :)
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