python中的StopIteration错误

Question

我正在使用wolframalpha和wit.ai，我试图构建从wit.ai音频而不是终端文本获取数据的wolframalpha。

我的代码是：

#!/usr/bin/python
import speech_recognition as sr
import wolframalpha
import sys

r = sr.Recognizer()
with sr.Microphone() as source:
    print("Say something!")
    audio = r.listen(source)


WIT_AI_KEY = "NQYEITRO5GL2Q2MZFIJE4UHWVNQEUROW"
try:
    print("Wit.ai thinks you said " + r.recognize_wit(audio, key=WIT_AI_KEY))
except sr.UnknownValueError:
    print("Wit.ai could not understand audio")
except sr.RequestError as e:
    print("Could not request results from Wit.ai service; {0}".format(e))


client = wolframalpha.Client('PR5756-H3EP749GGH')
print(r.recognize_wit(audio, key=WIT_AI_KEY))
res = client.query(r.recognize_wit(audio, key=WIT_AI_KEY))
print(next(res.results).text)

我面临这个错误：

MacBook-Air:Documents exepaul$ python ak.py
2016-02-22 23:05:04.429 Python[3003:122880] 23:05:04.428 WARNING:  140: This application, or a library it uses, is using the deprecated Carbon Component Manager for hosting Audio Units. Support for this will be removed in a future release. Also, this makes the host incompatible with version 3 audio units. Please transition to the API's in AudioComponent.h.
Say something!
Wit.ai thinks you said seven
seven
Traceback (most recent call last):
  File "ak.py", line 24, in <module>
    print(next(res.results).text)
StopIteration

如何将数据提供给wolframalpha api？

Answer 1

当生成器耗尽且没有更多的值时，就会引发StopIteration，因此完全可以得到一个值。但你得自己处理：

try:
    print(next(res.results).text)
except StopIteration:
    print("No more suggesstions.")