If you’re hacking Django and get this…
ImproperlyConfigured: Error while importing URLconf 'proj.app.urls': 'tuple' object is not callable
…you’re probably missing a comma in your URL configuration as Rajesh Dhawan pointed out.
Django pros can move along, I know you never make typos. 
*cough* why i would never….
(yes i got that error, googled it and came here… probably should get some sleep 
)