What's a standard way to do a no-op in python?
<p>I often find myself writing if / elif / else constructs in python, and I want to include options which can occur, but for which the corresponding action is to do nothing. I realise I could just exclude those if statements, but for readability I find it helps to include them all, so that if you are looking through the code you can see what happens as a result of each option. How do I code the no-op? Currently, I'm doing it like this:</p>

<pre><code>no_op = 0

if x == 0:
    y = 2 * a
elif x == 1:
    z = 3 * b
elif x == 3:
    no_op
</code></pre>

<p>(The code is actually quite a bit longer than that, and more complicated. This is just to illustrate the structure).</p>

<p>I don't like using a variable as a no-op, but it's the neatest way I could think of. Is there a better way?</p>
