How to calculate ‘c’

I skipped lambda function several times when I was reading and learning Python. You have:

The Zen of Python as a part of hacker’s personality

90% of my “pure typing” goes in markdown (thanks to Gruber and Swartz).
90% of my “pure typing” goes in Vim (credits to all the crew).
Thus as the folding idea is brilliant I was fighting to get simple folding in Vim + markdown based on # headers. I felt a lack of it, but I was too impatient to implement it or look for it.
Then on Stack, I found what you see below and It made me happy.
Not perfect, but good enough and works beautifully.

Tools I’m using

How about starting programming when you are half a century old?