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一个多进程程序，主进程阻塞，子进程不断打印等待效果直到主进程结束，原理是\x08在ascii中表示退格键，理解为打印完后立马删掉打印下一个内容。

import sys, time  
import multiprocessing  DELAY = 0.1  
DISPLAY = [ '|', '/', '-', '\\' ]  def spinner_func(before='', after=''):  write, flush = sys.stdout.write, sys.stdout.flush  pos = -1 while True:  pos = (pos + 1) % len(DISPLAY)  msg = before + DISPLAY[pos] + after  write(msg)  flush()  write('\x08' * len(msg))  time.sleep(DELAY)  def long_computation():  time.sleep(5)  def run():  spinner = multiprocessing.Process(  None, spinner_func, args=('Please wait ... ', ''))  spinner.start()  try:  long_computation()  print('Computation done')  finally:  spinner.terminate()if __name__ == "__main__":run()

问题：
pycharm中看不见效果，在powershell或者cmd中可以看到效果。

解决：
pycharm设置Emulate terminal in output console