Fashiolista.com – Django at The Next Web – part 1

Fashiolista.com is launching in 7 days and has already been getting quite some attention. Techcrunch: 25 startups that will be shaping the next web. For Fashiolista we’ve been able to utilize a great deal of best practises learned in previous Django based sites. More on this topic later. For now I’m wondering if there are many other Django fans attending the next web conference.

The conference itself should be very interesting. Definitely looking forward to Werner Vogels and Joe Stump. The later seems to be running Django for SimpleGeo.

Django &Events &Fashiolista &Web Development tschellenbach 22 Apr 2010 13 Comments

Django based startup – YouTellMe.nl

YouTellMe.nl is a completely Django based startup located in Amsterdam. We’re probably one of the largest Django projects in terms of codebase. Pretty soon the famous nextweb awards are coming up. (remember those guys which broke into Michael Arrington’s house?). And we need some love from the Django community. Lots of it.

Pretty please nominate youtellme.nl for the next web!

Good articles coming soon to offset the bad karma for this shameless plug ;)


A couple of stats about the current codebase.

According to wc (including whitespace and comments) we currently have:

  • Python: 3,363,188 characters, 87926 lines, 655 files
  • Javascript: 940,536 characters, 24229 lines, 77 files

Django &Events &Web Development &YouTellMe tschellenbach 19 Mar 2010 3 Comments

Django query set iterator – for really large, querysets

When you try to iterate over a query set with about 0.5 million items (a few hundred megs of db storage), the memory usage can become somewhat problematic. Adding .iterator to your query set helps somewhat, but still loads the entire query result into memory. Cronjobs at YouTellMe.nl where unfortunately starting to fail. My colleague Rick came up with the following fix.

This solution chunks up the querying in bits of 1000 (by default). While this is somewhat heavier on your database (multiple queries) it seriously reduces the memory usage. Curious to hear how other django developers have worked around this problem.

import gc

def queryset_iterator(queryset, chunksize=1000):
    Iterate over a Django Queryset ordered by the primary key

    This method loads a maximum of chunksize (default: 1000) rows in it's
    memory at the same time while django normally would load all rows in it's
    memory. Using the iterator() method only causes it to not preload all the

    Note that the implementation of the iterator does not support ordered query sets.
    pk = 0
    last_pk = queryset.order_by('-pk')[0].pk
    queryset = queryset.order_by('pk')
    while pk < last_pk:
        for row in queryset.filter(pk__gt=pk)[:chunksize]:
            pk = row.pk
            yield row

#Some Examples:


#even better

Django snippet here.

Django &Python &Web Development &YouTellMe tschellenbach 03 Mar 2010 288 Comments

YTM launch!!

No more beta for YouTellMe.nl
The website which is taking over the Dutch product comparison market is officially going out of beta @ 8 o clock.
Party in Amsterdam, Keizersgracht 182 :) Festivities starting right now!


Things are going well, looking very forward to international launch.
We’ve changed a lot since the first reviews!


Beter pictures coming after the event :P

PS. Thanks to Python and Django, for enabling us to beat the competition :)

PSS. Next2News, eduhub, come and join :)

Apache &Business &Css &Django &Dutch &Events &Javascript &PHP &Prototype &Python &Symfony &Web Development &YouTellMe tschellenbach 11 Dec 2009 150 Comments

New YouTellMe release

We have been rolling out some awesome new features at YouTellMe.nl. The new version of the comparison system allows for the most flexible product comparison queries. Furthermore we now fully support product variations with easy selectors during price comparison.

Read the full story (in Dutch)

Business &Web Development &YouTellMe tschellenbach 08 Jun 2009 6 Comments

YouTellMe @ Marketing Facts

Marketing Facts just published their video interview with our co-founder Joost Nauta. If your Dutch is fluent go ahead and take a look:

Interview John Nauta (YouTellMe) from mfredactie on Vimeo.

Thanks to all the FrankWatching readers for the positive feedback on the previous article.

Dutch &YouTellMe tschellenbach 03 Feb 2009 2 Comments

Congrats to Ebuddy for winning the Crunchies!

I just noticed that Ebuddy has won the best international award at the Crunchies. Awesome to see a Dutch startup win it :) Go over to Ebuddy and congratulate them! (Found through NextWeb)

Events tschellenbach 10 Jan 2009 3 Comments

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