id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
29218	Custom URL converters break direct urls.py modules import	Sergey Fursov	nobody	"Hi.

I found this problem after conversion all urls in one of my projects to modern named params.
I created custom URL Converter class and registered it in root url conf
I test my project code using py.test with enabled `doctest-modules` option. With this option py.test imports all modules and search docstring tests in each. Same happens with individual urls.py modules, but direct module import fails with next stacktrace:
{{{
api/urls.py:86: in <module>
    name='module',
/usr/local/lib/python3.6/site-packages/django/urls/conf.py:70: in _path
    pattern = Pattern(route, name=name, is_endpoint=True)
/usr/local/lib/python3.6/site-packages/django/urls/resolvers.py:242: in __init__
    self.converters = _route_to_regex(str(route), is_endpoint)[1]
/usr/local/lib/python3.6/site-packages/django/urls/resolvers.py:225: in _route_to_regex
    ""URL route '%s' uses invalid converter %s."" % (original_route, e)
E   django.core.exceptions.ImproperlyConfigured: URL route 'modules/<slug:slug>/<uid:uid>/' uses invalid converter 'uid'.
}}}


I'm not sure if this issue should be solved inside Django itself, but I thought it would be helpful to report it.
"	Bug	closed	Core (URLs)	2.0	Normal	invalid			Unreviewed	0	0	0	0	0	0