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So you want to write a framework? Accidental lessons from a successful project Dr Russell Keith-Magee PyCon PH 2014

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I've got fingerprints elsewhere.

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This isn't about Python.

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This isn't about web frameworks.

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Best of Breed vs Batteries Included

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"Batteries Included" Frameworks "Everything comes in the box" One package to download/install Minimal dependencies No decisions to make Documentation on the parts

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"Best of Breed" Frameworks Pick from existing selection of libraries Glue logic to tie them together Many dependencies Multiple decisions may be required Documentation on integration

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Hybrids are possible.

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Why pick one over the other?

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History matters.

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It's hard to be best of breed when the breed doesn't exist yet.

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Ian Bicking and SQLObject http://bit.ly/bicking-goodbye

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Picking "best of breed" early can be detrimental.

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History matters.

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Backwards compatibility

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Time is relative.

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“ A rule of thumb that has worked for me is that if I'm excited to play around with something it probably doesn't belong in production ” Maciej Ceglowski (Pinboard)

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Backwards compatibility has a price.

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Batteries Included can still be backwards incompatible.

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Best of breed encourages you to pick and choose.

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Is a choice of batteries really what is required?

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"Batteries included" doesn't mean "Can't use other batteries".

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Messaging matters.

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Timing matters.

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The 90% framework.

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Out of the box experience matters.

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http://goo.gl/Epzms

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Implicit documentation

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Models and Forms class MyUser(models.Model): name = models.CharField(max_length=100) age = models.IntegerField() date_of_birth = models.DateField() class MyForm(forms.Form): name = forms.CharField(max_length=100) age = forms.IntegerField() date_of_birth = forms.DateField()

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Tools vs ecosystems

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Jacob's Tractor

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Tools vs ecosystems

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Metcalfe's Law: The utility of a network increases with the square of it's participants.

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Ecosystems

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Microframeworks

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Remember to share with the other children.

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Sending the wrong signals.

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Packaging systems matter.

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Community matters.

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Outreach is important.

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Absent friends

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http://bit.ly/malcolm-monkey-hat

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http://bit.ly/malcolm-plays-spassky

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Requiem in pace

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“ A society grows great when old men plant trees whose shade they know they shall never sit in. ” Greek proverb

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Kid, you can move mountains. (98 and ¾ percent guaranteed)

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He's not the messiah....

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Thanks! russell@keith-magee.com @freakboy3742 cecinestpasun.com djangoproject.com