我得到了一个nonetype

Question

def talk(text):
    engine.say(text)
    engine.runAndWait()
listener = sr.Recognizer()
engine = pyttsx3.init()
def take_command():
    try:
        with sr.Microphone() as source:
            talk('listening')
            voice = listener.listen(source)
            command = listener.recognize_google(voice)
            command = command.lower()
            command = command.replace('alexa', '')
            talk(command)
    except:
        pass
        
def run_alexa():
    command = take_command()
    print(command)
    if  'play' in command:
        song = command.replace('play','')
        pywhatkit.playonyt(song)
        talk('playing' + song)
    elif 'time' in command:
        time = datetime.datetime.now().strftime('%H %M %p')
        talk('time is' + time)
    elif 'search' in command:
        person = command.replace('search','')
        info = wikipedia.summary(person, 2)
        talk(info)
        print(info)
    elif 'joke' in command:
        talk(pyjokes.get_joke())
    elif 'google' in command:
        google = command.replace('google','')
        pywhatkit.search(google)
        talk(google)
    else:
        talk('say that again please')

我试图通过指定它是一个字符串来更改，但我失败了我正在运行这个，当我询问是否在响应中找到STR时，它告诉我STR是一个非类型，我不确定它是这样的，因为引号还是因为它在其他地方指定

Answer 1

如果你运行这个:

command = take_command()
print(command)

命令必须是None因为你的函数(take_command)不返回任何东西，所以默认返回None。