python - 这段代码的多处理解释是什么？

Question

import time, os 
from threading import Thread, current_thread 
from multiprocessing import Process, current_process 
   
COUNT = 200000000
SLEEP = 5

def cpu_bound(n): 
  
    pid = os.getpid() 
    threadName = current_thread().name 
    processName = current_process().name
    
    print("One") 
  
    while n>0: 
        n = n - 1
  
    print("Two") 

到底发生了什么？我理解了某些部分，但需要解释，请帮助某人...

标签： pythonpython-3.xmultithreadingpython-2.7multiprocessing