So you want to write a framework? Accidental lessons from a successful project

Transcript

1. So you want to write a framework? Accidental lessons from

   a successful project Dr Russell Keith-Magee PyCon PH 2014
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5. I've got fingerprints elsewhere.

6. This isn't about Python.

7. This isn't about web frameworks.

8. Best of Breed vs Batteries Included

9. "Batteries Included" Frameworks "Everything comes in the box" One package

   to download/install Minimal dependencies No decisions to make Documentation on the parts

10. "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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12. Hybrids are possible.

13. Why pick one over the other?

14. History matters.

15. It's hard to be best of breed when the breed

    doesn't exist yet.

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

17. Picking "best of breed" early can be detrimental.

18. History matters.

19. Backwards compatibility

20. Time is relative.

21. “ 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)

22. Backwards compatibility has a price.

23. Batteries Included can still be backwards incompatible.

24. Best of breed encourages you to pick and choose.

25. Is a choice of batteries really what is required?

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

27. Messaging matters.

28. Timing matters.

29. The 90% framework.

30. Out of the box experience matters.

31. http://goo.gl/Epzms

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33. Implicit documentation

34. 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()

35. Tools vs ecosystems

36. Jacob's Tractor

37. Tools vs ecosystems

38. Metcalfe's Law: The utility of a network increases with the

    square of it's participants.

39. Ecosystems

40. Microframeworks

41. Remember to share with the other children.

42. Sending the wrong signals.

43. Packaging systems matter.

44. Community matters.

45. Outreach is important.

46. Absent friends

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

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

49. Requiem in pace

50. “ A society grows great when old men plant trees

    whose shade they know they shall never sit in. ” Greek proverb

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

52. He's not the messiah....

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