python用x08覆盖上一次输出来模拟控制台等待效果，pycharm运行sys.stdout.write在控制台无打印的解决方法

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