Reduce the risk of circular imports.

Author: aaugustin

debug_toolbar/__init__.py

@@ -11,7 +11,7 @@
     VERSION = 'unknown'
 
 
-from .toolbar import DebugToolbar
+# Code that discovers files or modules in INSTALLED_APPS imports this module.
+# Reference URLpatterns with a string to avoid the risk of circular imports.
 
-
-urls = DebugToolbar.get_urls(), 'djdt', 'djdt'
+urls = 'debug_toolbar.toolbar', 'djdt', 'djdt'

debug_toolbar/toolbar.py

@@ -130,3 +130,6 @@ def get_urls(cls):
                 urlpatterns += panel_class.get_urls()
             cls._urlpatterns = urlpatterns
         return cls._urlpatterns
+
+
+urlpatterns = DebugToolbar.get_urls()