Question

每次运行代码时，我都会不断收到以下错误消息：

Attempting to parse Socialblade: https://socialblade.com/youtube/user/aantonop
Got no_of_videos: 325
Internal Server Error: /api/connect_youtube/
Traceback (most recent call last):
  File "/Users/test/projects/my-api/api/views.py", line 160, in post
    response.update(scraper.collect_creator_data(request.data['youtubeChannelUsername']))
  File "/Users/test/projects/my-api/api/scraper.py", line 23, in collect_creator_data
    process_socialblade(username)
  File "/Users/test/projects/my-api/api/scraper.py", line 68, in process_socialblade
    if no_of_subscribers:
UnboundLocalError: local variable 'no_of_subscribers' referenced before assignment

我怀疑是由于在脚本中使用了全局变量，但不确定如何纠正它。我已经设置了可以通过多种方法处理的全局变量。

我该如何解决？下面的代码：

from bs4 import BeautifulSoup
from test.settings.base import YOUTUBE_URL, YOUTUBE_API_KEY

from urllib.request import Request, urlopen
import ssl

no_of_videos = 0
no_of_subscribers = 0
no_of_views = 0
avg_views = 0
like_count = 0
dislike_count = 0
channel_id = None
photo = None
description = None
start_date = None
title = None
keywords = None
sb_grade = None


def collect_creator_data(username):
    process_socialblade(username)
    process_youtube(username)
    return {"id": channel_id,
            "photo": photo,
            "title": title,
            "like_count": like_count,
            "dislike_count": dislike_count,
            "keywords": keywords,
            "description": description,
            "start_date": start_date,
            "no_of_videos": no_of_videos,
            "no_of_subscribers": no_of_subscribers,
            "no_of_views": no_of_views,
            "avg_views": avg_views,
            "sb_grade": sb_grade
            }


def process_socialblade(username):
    socialblade_user_url = 'https://socialblade.com/youtube/user/' + username
    context = ssl._create_unverified_context()
    print('Attempting to parse Socialblade:', socialblade_user_url)
    q = Request(socialblade_user_url)
    q.add_header('User-Agent', 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) '
                               'Chrome/23.0.1271.64 Safari/537.11')
    q.add_header('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8')
    q.add_header('Accept-Charset', 'ISO-8859-1,utf-8;q=0.7,*;q=0.3')
    q.add_header('Accept-Encoding', 'none')
    q.add_header('Accept-Language', 'en-US,en;q=0.8')
    q.add_header('Connection', 'keep-alive')
    socialblade_user_html = urlopen(q, context=context).read()
    if socialblade_user_html:
        soup = BeautifulSoup(socialblade_user_html, "html.parser")
        youtube_user_top_info_list = soup.findAll('div', attrs={'class': 'YouTubeUserTopInfo'})
        for i in youtube_user_top_info_list:
            try:
                no_of_videos = i.find('span', id='youtube-stats-header-uploads').get_text()
            except AttributeError:
                pass
            if no_of_videos:
                print('Got no_of_videos:', no_of_videos)

            try:  
                no_of_subscribers = i.find('span', id='youtube-stats-header-subs').get_text()
            except AttributeError:
                pass
            if no_of_subscribers:
                print('Got no_of_subscribers:', no_of_subscribers)

            try:               
                no_of_views = i.find('span', id='youtube-stats-header-views').get_text()
            except AttributeError:
                pass
            if no_of_views:
                print('Got no_of_views:', no_of_views)
    else:
        print('Could not parse Socialblade:', socialblade_user_html)

我应该在process_socialblade中创建全局变量吗？

python中的全局变量导致UnboundLocalError

0 个答案: