python - 如何让python等待上一个任务完成？

Question

嗨，我正在 Mac 上试验语音合成，我总是在程序中放入 while 循环，以便我可以使用它们，直到我决定停止，并且使用此代码，它会重复“您想让我说什么？ ”同时它会说我告诉它说的任何话。

from Cocoa import NSSpeechSynthesizer
while 1==1
    sp = NSSpeechSynthesizer.alloc().initWithVoice_(None)
    sp.startSpeakingString_("What would you like me to say?")    
    say_1 = raw_input("What would you like me to say?")
    sp.startSpeakingString_(say_1)

有人可以告诉我如何告诉 python 等到它完成说出我告诉它的内容吗？

Answer 1

您似乎正在寻找 NSSpeechSynthesizer instance method: isSpeaking 。您可以编写一个轮询循环来测试它是否正在说话，并在不再说话时继续工作。像这样的事情:

import time
from Cocoa import NSSpeechSynthesizer
while 1:
    sp = NSSpeechSynthesizer.alloc().initWithVoice_(None)
    sp.startSpeakingString_("What would you like me to say?")    
    say_1 = raw_input("What would you like me to say?")
    sp.startSpeakingString_(say_1)
    
    while sp.isSpeaking():    # loop until it finish to speak
        time.sleep(0.9)       # be nice with the CPU
    
    print 'done speaking'

更新: time.sleep 比循环内的 continue 更好。后者会浪费大量的CPU和电池(正如@kindall所指出的)。

希望这有帮助!