Saturday, October 19, 2013

Site matching query does not exist. Lookup parameters were {'pk': 1}

Django 1.5.1

I created sample app and run the syncdb (python syncdb) and it created default tables for the application. It didn't created the tables for the app's model. For that I had to run -

python syncdb --all

It took care of the other tables creation.

Though while accessing the app I run into following error -

Traceback (most recent call last):
  File "/Users/Jaimin/Apps/Github/kqotes/quote/lib/python2.7/site-packages/django/core/handlers/", line 187, in get_response
    response = middleware_method(request, response)
  File "/Users/Jaimin/Apps/Github/kqotes/quote/lib/python2.7/site-packages/django/contrib/redirects/", line 23, in process_response
  File "/Users/Jaimin/Apps/Github/kqotes/quote/lib/python2.7/site-packages/django/db/models/", line 389, in get
    (self.model._meta.object_name, kwargs))
DoesNotExist: Site matching query does not exist. Lookup parameters were {'pk': 1}
Internal Server Error: /api-auth/login/

Tried different things, though couldn't figure anything.

Solution - After deleting the schema, I run python syncdb --all

bingo! All worked fine, and magically error is gone.

The issue was first time it didn't created entry for the app in site table (Its part of default tables when you do syncdb.)

select * from django_site

You can add manual entry, or drop the schema and run it again. That will assign the primary key object and app will come up fine.

Any other comments, observation, feel free to drop in comment.

Monday, October 14, 2013

install ipython notebook on mac

First why you need IPython to getting started with -

- It provides interactive capability with rich architecture
- Browser based support
- Visualization
- Save your exercise capability
- High performance tool for parallel computing and statistics analysis on datasets.

How to install ipython notebook on mac -

There are various ways you can install it, and you can find so many resources online, though I try here listing down the steps which I followed.

You can follow below instruction to install it -

$ pip install readline ipython
$ sudo pip install pyzmq
$ sudo pip install jinja2
$ sudo pip install tornado

Once all those gets installed fine, run following command to check whether it installed fine or not. You can check on command prompt first by typing ipython. 

You should be able to see on command prompt if you just run ipython -

Python 2.7.1 (r271:86832, Jul 31 2011, 19:30:53)
Type "copyright", "credits" or "license" for more information.

IPython 1.1.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]:

Once it comes up fine, start notebook

$ ipython notebook --pylab=inline

and it should open browser with -

You can click on New Notebook and try out few things to check its working fine, like 1+1, or 5*5 etc.

All Set!

Other clean recommended way to install is with proper virtualenv and requirement.txt file -

Create a seperate virtual env and run following requirement.txt


And install pip install -r requirement.txt

Above instruction is for mac, which is comparatively easy compared to other environments. Feel free to post comments or issues you run into while installing.