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我正在编写一个脚本，该脚本从指定的 subreddit 获取一些帖子，然后使用该 url 在 tumblr 上使用两个站点 api 和 python 创建一个图像帖子。我的问题是，当我尝试从 reddit 检索 url 以发布到 tumblr 时，我的程序改为打印随机 subreddit 的 url（总是 url https://www.reddit.com/r/accidentallyliberian/）我想知道什么错误在我的代码中，以及为什么它打印该 url 而不是我在 if 语句中指定的关于 url 中包含“.img”或“.png”的字符串的一个。

import praw
import json
import pytumblr

reddit = praw.Reddit(client_id='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
                     client_secret='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
                     password='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
                     user_agent='url grabber by /u/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
                     username='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx')

oauth_token = 'http://www.tumblr.com/oauth/request_token'
AUTHORIZATION_URL = 'http://www.tumblr.com/oauth/authorize'
ACCESS_TOKEN_URL = 'http://www.tumblr.com/oauth/access_token'
consumer_key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
consumer_secret = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

client = pytumblr.TumblrRestClient(
  'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
  'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
  'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
  'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
)

#print(reddit.user.me())
def get_post_url(subreddit, amount):
    for submission in reddit.subreddit(subreddit).hot(limit = amount):
        if '.img' or '.png' in submission.url:
            client.create_photo('username', state="published", tags=["testing", "ok"],
                                source = submission.url)
            #urllib.request.urlretrieve(submission.url, filename)

            print(submission.url)
        else:
            print('')


if __name__ == '__main__':
    get_post_url('funny', 1)
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