ClientException: Invalid URL for Random Submission

Issue Description

For some subreddits an Invalid URL exception is thrown when I try to get a random submission.

Code:

import praw
from config.reddit import client

reddit = praw.Reddit(client_id = client['id'],
    client_secret = client['secret'],
    user_agent = client['agent'])

print(reddit.subreddit('pics').random()) # works
print(reddit.subreddit('wallpapers').random()) # does not work

Output:

7s53b4
Traceback (most recent call last):
  File "./test.py", line 9, in <module>
    print(reddit.subreddit('wallpapers').random()) # does not work
  File "/usr/local/lib/python3.6/site-packages/praw/models/reddit/subreddit.py", line 339, in random
    self._reddit.config.reddit_url, path))
  File "/usr/local/lib/python3.6/site-packages/praw/models/reddit/submission.py", line 125, in __init__
    self.id = self.id_from_url(url)
  File "/usr/local/lib/python3.6/site-packages/praw/models/reddit/submission.py", line 41, in id_from_url
    raise ClientException('Invalid URL: {}'.format(url))
praw.exceptions.ClientException: Invalid URL: https://www.reddit.com/r/wallpapers/

System Information

PRAW Version: 5.3.0 Python Version: 3.6.4 Operating System: Windows and Linux

[jarhill0]

I appreciate the response! Thanks for looking into it.

[bboe]

Re-opening given the discussion that this might be intentional behavior on Reddit’s end.

As far as I can tell, there is no way to tell whether a subreddit is excluded from /r/all.

It seems like this is the way to tell if a subreddit is excluded from /r/all. Even if there were such a setting, it’s not worth it to check since we get the feedback anyway. We could simply handle the ClientException for redirect inside random and raise a different exception in such cases. It would be good, however, to first get confirmation from Reddit that this is not actually a bug.