I remember this page made me go &quot;a-ha!&quot; and understand asynchronous programming years ago. <a href="http:&#x2F;&#x2F;krondo.com&#x2F;blog&#x2F;?p=1209" rel="nofollow">http:&#x2F;&#x2F;krondo.com&#x2F;blog&#x2F;?p=1209</a><p>I don&#x27;t think I ever finished the tutorial and fully Twisted in Python, but that mental model explained by the charts has since been very useful in all languages.