Cyclomatic complexity is a quantitive measure of program (procedure) complexity.

You can measure it in pylint and fail functions that have complexity over maximal value.

I tried duck-ducking it but found some old answers, so here is how to enable it.

1. It is installed by default on recent pylint, you need to tweak pylintrc;

2. You need to add following plugin:

   load-plugins=pylint.extensions.mccabe
   

3. Add max complexity to the Design section:

   [DESIGN]
   max-complexity=10