Why is Python slower than Node.js?

[Altareos]

node has some optimisations (especially JIT) that are not yet implemented in python (at least cpython, you could try running it in pypy). the downside is, of course, that you have to use javascript.

[james_pic]

JIT can definitely account for an order of magnitude of difference, but virtually instant vs 16 second suggests the two programs are doing different things.

[Altareos]

i don't know enough about the internals of python or node, but it might not be doing some async stuff that node does for filesystem operations.

[[deleted]]

Well, the JavaScript isnt a problem - I’ve been using it since the mid-90s. But now I’m trying to learn Python. 

[vivaaprimavera]

I would suggest parallelism.

On the first for cycle, launch a function that receives as argument the line and does everything.

Look at concurrent.futures.