子流程的常見做法Python

Question

不幸的是，我僅限於Python 2.4，並希望在腳本執行時運行ascii動畫（即旋轉的圓圈）我只是想知道常用的方法或實踐是做什麼的像這樣以及與解決方案相關的任何/所有資源，示例腳本將非常棒！我一直在使用os.sytem（'command'）並想要擺脫這種習慣。

謝謝！

Answer 1

執行此操作的一種可能方法是使用回車符「\ r」將光標返回到行的開頭，以便可以覆蓋先前寫入的字符。這允許您創建動畫，只要它適合當前行。例如：

import time 

def do_a_little_work(): 
    time.sleep(0.1) 

print "about to do work..." 

icons = ["-", "/", "|", "\\"] 
icon_idx = 0 

while True: 
    do_a_little_work() 
    #todo: check if work is done, and break out of the loop. 
    print "\r" + icons[icon_idx], 
    icon_idx = (icon_idx+1)%len(icons) 

print "\rdone." 

結果：

about to do work... 
- 

，這已經成爲

about to do work... 
/

，這已經成爲

about to do work... 
| 

，這已經成爲

about to do work... 
\ 

等等......最後成爲

about to do work... 
done. 

---

您可以使用threading與您的常規代碼同時運行動畫。

from threading import Thread 
import time 

def do_the_work(): 
    #execute your script here 

work_thread = Thread(target=do_the_work) 
print "Working..." 
work_thread.start() 

icons = ["-", "/", "|", "\\"] 
icon_idx = 0 
while work_thread.is_alive(): 
    time.sleep(0.1) 
    print "\r" + icons[icon_idx], 
    icon_idx = (icon_idx+1)%len(icons) 
print "\rdone"