Building a web framework: Django's design decisions

Building Django Jacob Kaplan-Moss PyCon March 29, 2009 http://jacobian.org/speaking/2009/pycon-designing-django/

History

Adrian/Simon

lawrence.com Wakarusa 2008 › Find photos Great 'cue. Cheap from the festival beer. View. Log in to here (new photos post › All ads this still coming in) and video week comments. posted here. More to be posted Cornmeal / Hoots & Hellmouth: Steeped in as soon as we dry out... the tradition of legendary acts, this Chicago band uses bluegrass as a springboard for long improvisational work and songs ranging from country and rock to jazz and funk ... School of Wak (Soggy More info Edition) (Ten Million Pounds

“The CMS”

Philosophy

Make development fast

Automate repetitive tasks

Best practices

“ The ink is never dry on these babies. ” — Adrian Holovaty

Choices

Open Source

BSD license

Pragmatism over Methodology

GoF? MVC? TDD?

Snake Oil

“ No silver bullet. ” — Fred Brooks Author of The Mythical Man-Month

The Real World

“ Build cool shit. ” — Rob Curley

Ramifications

“What’s the need?”

No architecture astronauts

Reinventing the wheel

“Magic” over boilerplate

Web development is boring

It should be fun!

APIs should match behavior, not show how they work

Ramifications

It can go too far.

Messy internals

More power in less code

Easier to document

“Full stack”

“Best of breed”

Why full stack?

Lack of choices at the time

“Glued together”

Ramifications

More control

Don’t repeat Zope’s mistakes

“ Innovation happens elsewhere. ” — Bill Joy

Small pieces advance quicker

“Sensible defaults”

“Opinionated Software”

Ego is dangerous

You can’t possibly predict what everyone wants

... so listen to your users! (this is harder than it sounds)

“One obvious way” over “pluggable components”

Autumn Modeling PDB PyORM SQLAlchemy SQLObject Storm ZODB

Choice is good for experts ...

... but not good for new users

More beginners

“ Don’t make me think. ” — Steve Krug

“ It seems ... that if choice is good, then more choice is better. The paradox is that this “obvious” truth isn’t true... a point can be reached where, with more choice, people are worse off. ” — Barry Schwartz “The Paradox of Choice”

Ramifications

Consistency

Make complicated things easy

Don’t reinvent the wheel

Set our own pace Skip to end

Choices in the future

Long tail or huge scale?

#2 Yahoo #5 Facebook #8 Wikipedia #16 Photobucket #19 Flickr #20 Comcast #23 Wordpress

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“Enterprise”

Is this a competition we want?

Backlash

“Rails doesn’t scale” s Maps News Shopping Gmail more ! Advan rails doesn't scale Search Prefe Results 1 - 10 of about 4,680,000 for rails doesn't scale. (0.0 Rails Doesn't Scale? . quot;I've heard a few people mention that they heard that Rails doesn't scale stions on how we might alleviate their doubt?quot; ... t.com/2008/03/rails-doesnt-scale.html - 31k - Cached - Similar pages Interview with Twitter Developer Alex Payne its: Ruby On Rails Can’t Scale at Brandon Werner // Apr 13, ... the rubber is d, and the thing doesn’t scale on the DB end. ... havior.com/5-question-interview-with-twitter-developer-alex-payne/ - 161k - ilar pages aid Rails doesn’t Scale?” Features

“Django doesn’t ...?” Maps News Shopping Gmail more ! Adv quot;django sucksquot; Search Pref Results 1 - 10 of about 189 for quot;django sucksquot;. (0 ks eaningless: Django sucks from Alan's clob. [RSS] Picture of the blogger ... o sucks: 21.5 ... nkila/blog/2006/05/21/Django%20sucks.html - 28k - Cached - Similar pages compression sucks phasis: 29.9; Hitman: 7.9. 2006, 8. Misc: 23.8. 2006, 6. DSP progress: 29.6; B is: 19.6; Atari ST audio: 17.6. 2006, 5. Django sucks: 21.5 ... l.fi/~alankila/blog/2007/09/15/jQuery%20compression%20sucks.html - 23k - - Similar pages

Keep out the ego

Invite criticism ... and take it well

Make conscious decisions

Thanks! http://jacobian.org/speaking/2009/pycon-designing-django/ <jacob@jacobian.org>

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Building a web framework: Django's design decisions

by Jacob Kaplan-Moss on Mar 29, 2009

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Building a web framework: Django’s design decisions — Presentation Transcript