Flask & Tweepy - 我无法处理错误

Question

I want to print when there is a problem with Tweepy. When I look at Tweepy's docs, it seems possible with the try except . But after try except, user variable does not come. I get this error in user_profile_image: UnboundLocalError: local variable 'user' referenced before assignment .

How can I solve this problem? Thank you

@app.route("/twitter", methods=['GET', 'POST'])
def twitter():
    if request.method == 'POST': 
        username = request.form.get('text')
        auth = tweepy.OAuthHandler("myoauthhandlers")
        auth.set_access_token("myaccesstokens")
        api = tweepy.API(auth)
        try:
            user = api.get_user(username)
        except tweepy.TweepError as e:
             print("Error")

        user_profile_image = user.profile_image_url.replace('normal', '400x400')

 

Answer 1

You need to define user with a statement like user = None before the try/except block. Here, it gets defined in the scope of the try/except block, and so isn't accessible from outside of it, hence the exception.