Hi Hannah, 
Have a look at this code:
import speech_recognition as sr
import webbrowser as wb
r1 = sr.Recognizer()
r2 = sr.Recognizer()
r3 = sr.Recognizer()
with sr.Microphone() as source:
    print('[search edureka: search youtube]')
    print('speak now')
    audio = r3.listen(source)
if 'edureka' in r2.recognize_google(audio):
    r2 = sr.Recognizer()
    url = '<a href="https://www.edureka.co/">https://www.edureka.co/</a>'
    with  sr.Microphone() as source:
        print('search your query')
        audio = r2.listen(source)
        try:
            get = r2.recognize_google(audio)
            print(get)
            wb.get().open_new(url + get)
        except sr.UnknownValueError:
            print('error')
        except sr.RequestError as e:
            print('failed'.format(e))
if 'video' in r1.recognize_google(audio):
    r1 = sr.Recognizer()
    url = '<a href="https://www.youtube.com/results?search_query=">https://www.youtube.com/results?search_query=</a>'
    with sr.Microphone() as source:
        print('search for a video')
        audio = r2.listen(source)
        try:
            get = r1.recognize_google(audio)
            print(get)
            wb.get().open_new(url + get)
        except sr.UnknownValueError:
            print('could not understand')
        except sr.RequestError as e:
            print('failed to get results'.format(e))
This code basically listens to your speech and does a google search on it. Have a look at this blog for a detailed explanation: https://www.edureka.co/blog/speech-recognition-python/