‘ascii’ codec can’t encode characters : ordinal not in range(128)

I work on a system which fetches data from a database (Postgres) using python & writes them into a csv file. Few days ago i came through an error which was showing "ascii codec can't encode characters : ordinal not in range(128)" whenever i tried to fetch data from a particular date range. Problem :  … Continue reading ‘ascii’ codec can’t encode characters : ordinal not in range(128)

Make primary key with two or more field in Django

Most of the time, people don't actually need their composite (multi-column) key to be the primary key. Django operates best with surrogate keys -  that is, it automatically defines an autoincrement field called id and sets that to be the primary key. That is suitable for almost all the users. If you then need to enforce … Continue reading Make primary key with two or more field in Django

Python Decorators

Python Conquers The Universe

In August 2009, I wrote a post titled Introduction to Python Decorators. It was an attempt to explain Python decorators in a way that I (and I hoped, others) could grok.

Recently I had occasion to re-read that post. It wasn’t a pleasant experience ? it was pretty clear to me that the attempt had failed.

That failure ? and two other things ? have prompted me to try again.

  • Matt Harrison has published an excellent e-book Guide to: Learning Python Decorators.
  • I now have a theory about why most explanations of decorators (mine included) fail, and some ideas about how better to structure an introduction to decorators.

There is an old saying to the effect that “Every stick has two ends, one by which it may be picked up, and one by which it may not.” I believe that most explanations of decorators fail because they pick…

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Cloud computing implementation – Eucalyptus

On 24th of December i attended a online session on "Open Cloud" using Eucalyptus Community Cloud on #dgplug channel on freenode. It was organized by Kushal Das. We went through the different features of the user console. We created Key-Pairs & Security groups. I was unable to attend rest of session due to poor internet.I … Continue reading Cloud computing implementation – Eucalyptus