An Introduction to Django

Django is a Python MVC web framework "that encourages rapid development and clean, pragmatic design." In this presentation, we'll explore how Django makes application development easy and fast by re-building the South Dakota Code Camp website. Python experience is not required.

Transcript

1. AN INTRODUCTION TO DJANGO Tyler Harms / @harmstyler
3. "DJANGO IS A HIGH-LEVEL PYTHON WEB FRAMEWORK THAT ENCOURAGES RAPID DEVELOPMENT AND CLEAN, PRAGMATIC DESIGN." https://www.djangoproject.com/
4. Discus Instagram Mozilla OpenStack Pinterest PolitiFact.com Rdio The New York Times The Washington Post NASA Lanyrd
5. MONTY PYTHON Guido van Rossum spam & eggs Significant White Space i m p o r t t h i s T h e Z e n o f P y t h o n , b y T i m P e t e r s B e a u t i f u l i s b e t t e r t h a n u g l y . E x p l i c i t i s b e t t e r t h a n i m p l i c i t . S i m p l e i s b e t t e r t h a n c o m p l e x . C o m p l e x i s b e t t e r t h a n c o m p l i c a t e d . F l a t i s b e t t e r t h a n n e s t e d . S p a r s e i s b e t t e r t h a n d e n s e . R e a d a b i l i t y c o u n t s . . . .
6. INSTALLING DJANGO $ p i p i n s t a l l d j a n g o $ d j a n g o - a d m i n . p y s t a r t p r o j e c t s d c c s d c c ├ ─ ─ m a n a g e . p y └ ─ ─ s d c c ├ ─ ─ _ _ i n i t _ _ . p y ├ ─ ─ s e t t i n g s . p y ├ ─ ─ u r l s . p y └ ─ ─ w s g i . p y
7. DJANGO-ADMIN.PY
8. MANAGE.PY
9. MANAGE.PY $ m a n a g e . p y < c o m m a n d > [ o p t i o n s ]
10. SYNCDB $ p y t h o n m a n a g e . p y s y n c d b C r e a t i n g t a b l e s . . . C r e a t i n g t a b l e a u t h _ p e r m i s s i o n C r e a t i n g t a b l e a u t h _ g r o u p _ p e r m i s s i o n s C r e a t i n g t a b l e a u t h _ g r o u p C r e a t i n g t a b l e a u t h _ u s e r _ g r o u p s C r e a t i n g t a b l e a u t h _ u s e r _ u s e r _ p e r m i s s i o n s C r e a t i n g t a b l e a u t h _ u s e r C r e a t i n g t a b l e d j a n g o _ c o n t e n t _ t y p e C r e a t i n g t a b l e d j a n g o _ s e s s i o n C r e a t i n g t a b l e d j a n g o _ s i t e
11. RUNSERVER $ p y t h o n m a n a g e . p y r u n s e r v e r V a l i d a t i n g m o d e l s . . . 0 e r r o r s f o u n d N o v e m b e r 0 9 , 2 0 1 3 - 1 3 : 2 9 : 0 7 D j a n g o v e r s i o n 1 . 5 . 5 , u s i n g s e t t i n g s ' s d c c . s e t t i n g s ' D e v e l o p m e n t s e r v e r i s r u n n i n g a t h t t p : / / 1 2 7 . 0 . 0 . 1 : 8 0 0 0 / Q u i t t h e s e r v e r w i t h C O N T R O L - C . http://localhost:8000
12. STARTAPP python manage.py startapp <app_name> $ p y t h o n m a n a g e . p y s t a r t a p p c a m p s p e a k e r s ├ ─ ─ c a m p s p e a k e r s │ ├ ─ ─ _ _ i n i t _ _ . p y │ ├ ─ ─ m o d e l s . p y │ ├ ─ ─ t e s t s . p y │ └ ─ ─ v i e w s . p y ├ ─ ─ m a n a g e . p y └ ─ ─ s d c c ├ ─ ─ _ _ i n i t _ _ . p y ├ ─ ─ s e t t i n g s . p y ├ ─ ─ u r l s . p y ├ ─ ─ w s g i . p y
13. SETTINGS.PY
14. MVT? (mvc)
15. Model = Model (ORM) View = Controller Template = View MODEL-VIEW-TEMPLATE Weird nameing convention, but follows M-V-C design pattern.
16. MODELS
17. MODELS f r o m d j a n g o . d b i m p o r t m o d e l s c l a s s S p e a k e r ( m o d e l s . M o d e l ) : f i r s t _ n a m e = m o d e l s . C h a r F i e l d ( m a x _ l e n g t h = 2 0 0 ) l a s t _ n a m e = m o d e l s . C h a r F i e l d ( m a x _ l e n g t h = 2 0 0 ) s l u g = m o d e l s . S l u g F i e l d ( u n i q u e = T r u e ) c l a s s M e t a : o r d e r i n g = [ ' l a s t _ n a m e ' ] d e f _ g e t _ f u l l _ n a m e ( s e l f ) : r e t u r n ' % s % s ' % ( s e l f . f i r s t _ n a m e , s e l f . l a s t _ n a m e ) f u l l _ n a m e = p r o p e r t y ( _ g e t _ f u l l _ n a m e ) d e f _ _ u n i c o d e _ _ ( s e l f ) : r e t u r n s e l f . f u l l _ n a m e
18. DJANGO ADMIN
19. DJANGO ADMIN f r o m d j a n g o . c o n f . u r l s i m p o r t p a t t e r n s , i n c l u d e , u r l # U n c o m m e n t t h e n e x t t w o l i n e s t o e n a b l e t h e a d m i n : f r o m d j a n g o . c o n t r i b i m p o r t a d m i n a d m i n . a u t o d i s c o v e r ( ) u r l p a t t e r n s = p a t t e r n s ( ' ' , # E x a m p l e s : # u r l ( r ' ^ $ ' , ' s d c c . v i e w s . h o m e ' , n a m e = ' h o m e ' ) , # u r l ( r ' ^ s d c c / ' , i n c l u d e ( ' s d c c . f o o . u r l s ' ) ) , # U n c o m m e n t t h e a d m i n / d o c l i n e b e l o w t o e n a b l e a d m i n d o c u m e n t a t i o n : # u r l ( r ' ^ a d m i n / d o c / ' , i n c l u d e ( ' d j a n g o . c o n t r i b . a d m i n d o c s . u r l s ' ) ) , # U n c o m m e n t t h e n e x t l i n e t o e n a b l e t h e a d m i n : u r l ( r ' ^ a d m i n / ' , i n c l u d e ( a d m i n . s i t e . u r l s ) ) , )
20. DJANGO ADMIN f r o m d j a n g o . c o n t r i b i m p o r t a d m i n f r o m . m o d e l s i m p o r t S p e a k e r a d m i n . s i t e . r e g i s t e r ( S p e a k e r )
21. DJANGO ADMIN Activate the Admin App I N S T A L L E D _ A P P S = ( ' d j a n g o . c o n t r i b . a u t h ' , ' d j a n g o . c o n t r i b . c o n t e n t t y p e s ' , ' d j a n g o . c o n t r i b . s e s s i o n s ' , ' d j a n g o . c o n t r i b . s i t e s ' , ' d j a n g o . c o n t r i b . m e s s a g e s ' , ' d j a n g o . c o n t r i b . s t a t i c f i l e s ' , # U n c o m m e n t t h e n e x t l i n e t o e n a b l e t h e a d m i n : ' d j a n g o . c o n t r i b . a d m i n ' , # U n c o m m e n t t h e n e x t l i n e t o e n a b l e a d m i n d o c u m e n t a t i o n : # ' d j a n g o . c o n t r i b . a d m i n d o c s ' , )
22. VIEWS
23. VIEWS Functional Based Views f r o m d j a n g o . s h o r t c u t s i m p o r t r e n d e r f r o m d j a n g o . h t t p i m p o r t H t t p 4 0 4 f r o m d j a n g o i m p o r t t e m p l a t e f r o m . m o d e l s i m p o r t S p e a k e r d e f i n d e x ( r e q u e s t ) : t r y : s p e a k e r _ l i s t = S p e a k e r . o b j e c t s . a l l ( ) e x c e p t S p e a k e r . D o e s N o t E x i s t : r a i s e H t t p 4 0 4 r e t u r n r e n d e r ( r e q u e s t , ' c a m p s p e a k e r s / s p e a k e r _ l i s t . h t m l ' , { ' s p e a k e r _ l i s t ' : s p e a k e r _ l i s t } )
24. VIEWS Class Based Views Different Class Based Views exist for different tasks f r o m d j a n g o . v i e w s . g e n e r i c i m p o r t T e m p l a t e V i e w c l a s s I n d e x V i e w ( T e m p l a t e V i e w ) : t e m p l a t e _ n a m e = " c a m p s p e a k e r s / i n d e x . h t m l "
25. VIEWS Class Based Views cont. f r o m d j a n g o . v i e w s . g e n e r i c i m p o r t L i s t V i e w f r o m . m o d e l s i m p o r t S p e a k e r c l a s s B o o k L i s t V i e w ( L i s t V i e w ) : m o d e l = S p e a k e r d e f g e t _ c o n t e x t _ d a t a ( s e l f , * * k w a r g s ) : # C a l l t h e b a s e i m p l e m e n t a t i o n f i r s t t o g e t a c o n t e x t c o n t e x t = s u p e r ( B o o k L i s t V i e w , s e l f ) . g e t _ c o n t e x t _ d a t a ( * * k w a r g s ) # A d d i n a Q u e r y S e t o f a l l t h e b o o k s c o n t e x t [ ' s p e a k e r _ l i s t ' ] = S p e a k e r . o b j e c t s . a l l ( ) r e t u r n c o n t e x t
26. ROUTES
27. ROUTES f r o m d j a n g o . c o n f . u r l s i m p o r t p a t t e r n s , i n c l u d e , u r l # U n c o m m e n t t h e n e x t t w o l i n e s t o e n a b l e t h e a d m i n : f r o m d j a n g o . c o n t r i b i m p o r t a d m i n a d m i n . a u t o d i s c o v e r ( ) u r l p a t t e r n s = p a t t e r n s ( ' ' , # E x a m p l e s : # u r l ( r ' ^ $ ' , ' s d c c . v i e w s . h o m e ' , n a m e = ' h o m e ' ) , # u r l ( r ' ^ s d c c / ' , i n c l u d e ( ' s d c c . f o o . u r l s ' ) ) , u r l ( r ' ^ s p e a k e r s / ' , i n c l u d e ( ' c a m p s p e a k e r s . u r l s ' ) ) , # U n c o m m e n t t h e a d m i n / d o c l i n e b e l o w t o e n a b l e a d m i n d o c u m e n t a t i o n : # u r l ( r ' ^ a d m i n / d o c / ' , i n c l u d e ( ' d j a n g o . c o n t r i b . a d m i n d o c s . u r l s ' ) ) , # U n c o m m e n t t h e n e x t l i n e t o e n a b l e t h e a d m i n : u r l ( r ' ^ a d m i n / ' , i n c l u d e ( a d m i n . s i t e . u r l s ) ) , )
28. ROUTES f r o m d j a n g o . c o n f . u r l s i m p o r t p a t t e r n s , u r l f r o m . v i e w s i m p o r t B o o k L i s t V i e w i m p o r t v i e w s u r l p a t t e r n s = p a t t e r n s ( ' ' , ( r ' ^ l i s t $ ' , B o o k L i s t V i e w . a s _ v i e w ( ) ) , u r l ( r ' ^ $ ' , v i e w s . i n d e x , n a m e = ' i n d e x ' ) , )
29. TEMPLATES
30. TEMPLATES { % b l o c k c o n t e n t % } { % e n d b l o c k % } { { s p e a k e r } }
31. TIPS & TRICKS
32. SOUTH "This is South, intelligent schema and data migrations for ​ Django projects" Replaces syncdb. $ p y t h o n m a n a g e . p y s c h e m a m i g r a t i o n c a m p s p e a k e r s - - i n i t i a l $ p y t h o n m a n a g e . p y m i g r a t e c a m p s p e a k e r s
33. DIRECTORY VARIABLES i m p o r t o s P R O J E C T _ D I R = o s . p a t h . d i r n a m e ( o s . p a t h . a b s p a t h ( _ _ f i l e _ _ ) ) B A S E _ D I R = o s . p a t h . a b s p a t h ( o s . p a t h . j o i n ( P R O J E C T _ D I R , ' . . / . . / ' ) )
34. DJANGO DEBUG TOOLBAR
35. RESOURCES
36. RESOURCES https://docs.djangoproject.com http://learnpythonthehardway.org/book/ https://github.com/gregmalcolm/python_koans/
37. RESOURCES
38. THANKS! http://spkr8.com/t/27871