问题 I want to use my raspberry pi to announce some text. i have installed pyttsx but not able to use it.i am using python2.7 my program: import pyttsx engine= pyttsx.init() engine.setProperty('rate',70) voices=engine.getProperty('voices') for voice in voices: print "Using voice:", repr(voice) engine.setProperty('voice',voice.id) engine.say("Hello Hello Hello") engine.runAndWait() but i am getting this error: Traceback (most recent call last): File "/home/pi/announce.py", line 2, in <module>