Python语音助手语音转文本无法匹配if语句问题求助

我用Python开发了名为Harvey的个人助手，跟着YouTube教程实现了部分功能：助手能播报“All systems nominal”，可以识别语音并重复内容、在终端打印，但语音识别结果始终无法匹配if语句，每次都进入else分支。我怀疑问题出在query = ParseCommand().lower().split()或if query[0] == activationword:这两行。

我的代码如下：

import datetime
import speech_recognition as sr 
import pyttsx3
import webbrowser
import wikipedia
import wolframalpha

#Speech Init
engine = pyttsx3.init()
voices = engine.getProperty('voices')
engine.setProperty('voices', voices[0].id) #0, male / 1, female
activationword = 'Harvey' #should be single word

def speak(text, rate = 120):
    engine.setProperty('rate', rate)
    engine.say(text)
    engine.runAndWait()

def ParseCommand():
    listener = sr.Recognizer()
    print('Listening for a command')
    
    with sr.Microphone() as source: #uses computer default mic
        listener.pause_threshold = 2
        input_speech = listener.listen(source)
    
    try:
        print("Understanding...")
        query = listener.recognize_google(input_speech, language='en_us')
        print(f'The input speech was: {query}')

    except Exception as exception:
        print("Excuse me?")
        speak('Excuse me?')

        print(exception)
        return 'None'
    
    return query

# Main Loop
if __name__ == '__main__':
    speak('All systems nominal.')

    while True:
        #Parse as a list
        print("Test 1 Succesful")
        query = ParseCommand().lower().split()
        print("Test 2 Succesful")
        verbal= "I heard", query[0], "is that correct?"
        speak(verbal)

        if query[0] == activationword:
            print("Test 3 Succesful")
            speak('Listening')
            query.pop(0)

            #list commands
            if query[0] == 'say':
                if 'hello' in query:
                    speak('Hello Sire, What can I do for you today')

                else:
                    query.pop(0) #Removes say from the list
                    speech = ''.join(query)
                    speak(speech)

        else:
            speak("Sorry sire I'm confused")

问题原因及解决办法 #

问题核心是大小写不匹配：你把识别到的语音转成了小写（.lower()），但激活词activationword是大写开头的'Harvey'，所以query[0]是小写的'harvey'，和'Harvey'永远不相等，自然每次都进else分支。

另外还要考虑ParseCommand返回'None'的情况，这时候split()会得到['none']，也会触发else分支，建议额外处理这种情况。

修改方案（二选一即可） #

1. 统一激活词为小写：
   将activationword = 'Harvey'改成activationword = 'harvey'

2. 比较时统一转小写：
   将判断条件if query[0] == activationword:改成if query[0] == activationword.lower():

额外优化：处理识别失败的情况 #

在主循环里，先判断是否是识别失败的返回值，避免后续报错：

while True:
    print("Test 1 Succesful")
    query = ParseCommand().lower().split()
    print("Test 2 Succesful")
    
    # 处理识别失败的情况
    if query[0] == 'none':
        continue
    
    verbal= "I heard", query[0], "is that correct?"
    speak(verbal)
    
    # 后续判断逻辑...

内容的提问来源于stack exchange，提问作者Griffery64