An minimal Python thread pool class.
The main idea of this demo is show you how a threadpool works and setup a simple useful threadpool tool.
In test.py is a simple test file, which shows how to use the class ThreadPool:
tp = ThreadPool(3)
Initialize with 3 threads
tp.add_job(func, args)
Add your self-defined fuction that you want to parallelize and arguments for your function
tp.begin_to_finish()
Tell threads begin to run and finish automatically.