Flask or Django? Which to Choose for your Project

Often I get asked by fellow python developers why I chose Django/Flask for a particular project (usually by someone who prefers the framework I didn’t choose 😉). I think both frameworks are excellent and are well suited for a variety of use cases.

So how do I decide which to use for a new project? I found a simple heuristic to get 90% of the way to a final decision, and it’s pretty easy to follow: