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Your errors is not from ‘topic_id’, it’s about re.
If you use re.findall, it returns all list matched with your regex.
So in your case, the result of re.findall(r'topics/(?P<topic_id>\d+)/$', "topics/1/") will be ['1'].
So, of course, ['1'].topic_id raise AttributeError.
If you want to get group by 'topic_id', do like this
p = re.match(r'topics/(?P<topic_id>\d+)/$', "topics/1/")
p.group('topic_id') # it returns '1'
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From the documentation:
re.findall(pattern, string, flags=0)
Return all non-overlapping
matches of pattern in string, as a list of strings.
You are trying to retrieve an attribute from a list, which that list does not have.
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