python how to change functionality of a method during runtime
<p>Wondering if its is possible to change functionalify of a method during runtime e.g </p>

<pre><code>x = obj1 + obj2
return x+y
</code></pre>

<p>and you want to add </p>

<pre><code>x = obj1 + obj2
x+= obj3
return x+y
</code></pre>
