Python Multiprocessing Pool Map: AttributeError: Can't pickle local object

Question

I have a method inside a class that needs to do a lot of work in a loop, and I would like to spread the work over all of my cores.

I wrote the following code, which

Answer 1

I accidentally discovered a very nasty solution. It works, as long as you use a def statement. If you declare the function, that you want to use in Pool.map with the global keyword at the beginning of the function that solves it. But I would not rely on this in serious applications