#30500: Error reporting returns a circular import error on a python formatting
error, and does not restart the development server
-------------------------------------+-------------------------------------
Reporter: Runner15 | Owner: (none)
Type: | Status: closed
Cleanup/optimization |
Component: Error reporting | Version: 2.2
Severity: Normal | Resolution: invalid
Keywords: error reporting, | Triage Stage:
error, circular import | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Keryn Knight):
Adding details as I figure them out a bit, on the off-chance they prove
valuable:
instrumented `django/urls/resolvers.py`:
{{{
def url_patterns(...):
patterns = getattr(self.urlconf_module, "urlpatterns",
self.urlconf_module)
print('url_patterns', type(patterns), patterns)
}}}
instrumented `django/utils/autoreload.py`:
{{{
def run(...):
[...]
try:
v = get_resolver().urlconf_module
print('run', type(v), v)
[...]
}}}
Then, running the `utime(...)` script in a while loop as above, with
runserver running (and `a` commented out):
{{{
url_patterns <class 'list'> [<URLResolver <module 't30500.urls2' from
'/path/to/t30500/t30500/urls2.py'> (None:None) ''>]
run <class 'module'> <module 't30500.urls' from
'/path/to/t30500/t30500/urls.py'>
url_patterns <class 'list'> [<URLPattern ''>]
}}}
The order of those calls changes sometimes (for me), so I guess it's maybe
separate threads ''and'' non-deterministic? But importantly, they stay the
same types and values, by the look of it.
If `a` is uncommented, to raise `NameError: name 'a' is not defined`,
every time `NameError` is thrown, the only print is:
{{{
run <class 'module'> <module 't30500.urls' from
'/path/to/t30500/t30500/urls.py'>
Exception in thread django-main-thread: [...]
}}}
when `ImproperlyConfigured: The included URLconf 't30500.urls' ...` is
thrown, the only print is **instead**, this:
{{{
url_patterns <class 'module'> <module 't30500.urls' from
'/path/to/t30500/t30500/urls.py'>
Exception in thread django-main-thread: [...]
}}}
This seems like an important distinction (to me, with my highly
sophisticated print-debugging, as pdb was being little help), and
**additionally** the patterns variable is a module, rather than a list.
--
Ticket URL: <https://code.djangoproject.com/ticket/30500#comment:12>
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