lostpropertyhq.com Learn something new A quick look into the Pyramid web framework / Created byRach Belaid @rachbelaid 

Who I am. Python charmer, Git Lover and a PostgreSQL Fan. I build web stuff and love learning something new. work at Lost property 

I may be harsh! ... but I mean well Django is a great framework! It allowed me to make my living from Python, a language that I ❤ 

So why look somewhere else then? To discover other solutions to common problems You are a python developer and not a Django developer It's fun and exicting Due to frustrations To extend your mind and toolbelt with new tools To come back with a fresh eyes 

Loads of frameworks out there! Web2py Flask Pyramid TurboGears Grok Zope 

Why Pyramid? 

I was living a happy life and had my own swiss army knife as a toolkit 

One day! Somebody asked me to build this! 

What I really needed! was this! 

Modular Flexible Agnostic, Not opiniated Extensible Fast Full Control For small and big webapps 

And sometimes ... ...doing things is easier than undoing things 

What's Pyramid? 

Simple example f r o m w s g i r e f . s i m p l e _ s e r v e r i m p o r t m a k e _ s e r v e r f r o m p y r a m i d . c o n f i g i m p o r t C o n f i g u r a t o r f r o m p y r a m i d . r e s p o n s e i m p o r t R e s p o n s e d e f h e l l o _ w o r l d ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' H e l l o w o r l d ! ' ) i f _ _ n a m e _ _ = = ' _ _ m a i n _ _ ' : c o n f i g = C o n f i g u r a t o r ( ) c o n f i g . a d d _ r o u t e ( ' h o m e ' , ' / ' ) c o n f i g . a d d _ v i e w ( h e l l o _ w o r l d , r o u t e _ n a m e = ' h o m e ' ) a p p = c o n f i g . m a k e _ w s g i _ a p p ( ) s e r v e r = m a k e _ s e r v e r ( ' 0 . 0 . 0 . 0 ' , 8 0 8 0 , a p p ) s e r v e r . s e r v e _ f o r e v e r ( ) 

Same example but another way f r o m w s g i r e f . s i m p l e _ s e r v e r i m p o r t m a k e _ s e r v e r f r o m p y r a m i d . c o n f i g i m p o r t C o n f i g u r a t o r f r o m p y r a m i d . r e s p o n s e i m p o r t R e s p o n s e f r o m p y r a m i d . v i e w i m p o r t v i e w _ c o n f i g @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' h o m e ' ) d e f h e l l o _ w o r l d ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' H e l l o w o r l d ! ' ) i f _ _ n a m e _ _ = = ' _ _ m a i n _ _ ' : c o n f i g = C o n f i g u r a t o r ( ) c o n f i g . a d d _ r o u t e ( ' h o m e ' , ' / ' ) c o n f i g . s c a n ( ) # r u n t h e a p p a p p = c o n f i g . m a k e _ w s g i _ a p p ( ) s e r v e r = m a k e _ s e r v e r ( ' 0 . 0 . 0 . 0 ' , 8 0 8 0 , a p p ) s e r v e r . s e r v e _ f o r e v e r ( ) 

TIMTOWTDI. Blasphemy !! with pyramid there is more than one way to do things!!! I want my tools to bend to my needs and not me to them. 

Battery not included. Nor the shell, nor the wheels. Time to go shopping and get the best out there!! 

Pyramid has “extensible” applications, not pluggable applications 

Routing View != Route Base on method, xhr, param, custom function(predicate) 

Routing Example via Method @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' t e s t ' , r e q u e s t _ m e t h o d = ' G E T ' ) d e f h e l l o _ w o r l d ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' H e l l o w o r l d ! ' ) @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' t e s t ' , r e q u e s t _ m e t h o d = ' P O S T ' ) d e f t h a n k s _ y o u ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' T h a n k s y o u ' ) i f _ _ n a m e _ _ = = ' _ _ m a i n _ _ ' : c o n f i g = C o n f i g u r a t o r ( ) c o n f i g . a d d _ r o u t e ( ' t e s t ' , ' / t e s t ' ) c o n f i g . s c a n ( ) 

Routing Example with param @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' a c t i o n ' , m a t c h _ p a r a m = ' a c t i o n = h e l l o ' ) d e f h e l l o _ v i e w ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' H e l l o ' ) @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' a c t i o n ' , m a t c h _ p a r a m = ' a c t i o n = b y e ' ) d e f b y e _ v i e w ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' B y e B y e ' ) @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' a c t i o n ' , m a t c h _ p a r a m = ' a c t i o n ' ) d e f b y e _ v i e w ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' L e t ’ s c o n t i n u e ' ) i f _ _ n a m e _ _ = = ' _ _ m a i n _ _ ' : c o n f i g = C o n f i g u r a t o r ( ) c o n f i g . a d d _ r o u t e ( ' a c t i o n ' , ' / { a c t i o n : \ w + } ' ) c o n f i g . s c a n ( ) 

Routing Example with predicate d e f u s e l e s s _ p r e d i c a t e ( i n f o , r e q u e s t ) : f r o m d a t e t i m e i m p o r t d a t e t o d a y = d a t e . t o d a y ( ) r e t u r n t o d a y . d a y = = 2 9 & & t o d a y . m o n t h = = 2 @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' h o m e ' , c u s t o m _ p r e d i c a t e = u s e l e s s _ p r e d i c a t e ) d e f u s e l e s s _ v i e w ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' L e a p y e a r ' ) i f _ _ n a m e _ _ = = ' _ _ m a i n _ _ ' : c o n f i g = C o n f i g u r a t o r ( ) c o n f i g . a d d _ r o u t e ( ' h o m e ' , ' / ' ) c o n f i g . s c a n ( ) 

Routing with class and method too @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' t e s t ' ) d e f t e s t ( r e q u e s t ) : r e t u r n R e s p o n s e ( ' o k ' ) c l a s s T e s t ( o b j e c t ) : d e f _ _ i n i t _ _ ( s e l f , r e q u e s t ) : s e l f . r e q u e s t = r e q u e s t @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' t e s t ' ) d e f t e s t ( s e l f ) : r e t u r n R e s p o n s e ( ' o k ' ) @ v i e w _ c o n f i g ( r o u t e _ n a m e = ' t e s t ' ) c l a s s T e s t ( o b j e c t ) : d e f _ _ i n i t _ _ ( s e l f , r e q u e s t ) : s e l f . r e q u e s t = r e q u e s t d e f _ _ c a l l _ _ ( s e l f ) : r e t u r n R e s p o n s e ( ' o k ' ) 

ORM You can choose but the choice is easy. 

SQLAlchemy, the only true ORM Once you go SQLAlchemy, you never go back. Finally an ORM that allows you to write better queries. 

Templating Mako Chameleon Jinja2 ... and they are fast. 

Admin Sorry, there is none ... but you may have a chance with FormAlchemy. 

Hooks Tweens, Event, Finished, Callbacks, Response Adapter ... to play ther role of middleware, context processor django 

Tweens A tween (a contraction of the word “between”) is a bit of code that sits between the Pyramid router’s main request handling function and the upstream WSGI 

Response Adaptor to control how Pyramid treats the view result f r o m p y r a m i d . r e s p o n s e i m p o r t R e s p o n s e d e f s t r i n g _ r e s p o n s e _ a d a p t e r ( s ) : r e s p o n s e = R e s p o n s e ( s ) r e t u r n r e s p o n s e # c o n f i g i s a n i n s t a n c e o f p y r a m i d . c o n f i g . C o n f i g u r a t o r c o n f i g . a d d _ r e s p o n s e _ a d a p t e r ( s t r i n g _ r e s p o n s e _ a d a p t e r , s t r ) 

Events loads of events : NewResponse, ApplicationCreated, ... f r o m p y r a m i d . e v e n t s i m p o r t s u b s c r i b e r f r o m p y r a m i d . e v e n t s i m p o r t B e f o r e R e n d e r @ s u b s c r i b e r ( B e f o r e R e n d e r ) d e f a d d _ g l o b a l ( e v e n t ) : e v e n t [ ' m y k e y ' ] = ' f o o ' 

Subscriber Predicates to narrow the set of circumstances in which a subscriber to an event will be called 

Finished Callback Will be call no matter what happens! i m p o r t l o g g i n g l o g = l o g g i n g . g e t L o g g e r ( _ _ n a m e _ _ ) d e f l o g _ c a l l b a c k ( r e q u e s t ) : " " " L o g i n f o r m a t i o n a t t h e e n d o f r e q u e s t " " " l o g . d e b u g ( ' R e q u e s t i s f i n i s h e d . ' ) r e q u e s t . a d d _ f i n i s h e d _ c a l l b a c k ( l o g _ c a l l b a c k ) 

It's Alive! It's Alive! 

Validation Colander, FormEncode 

Form WTForms, Deform with colander, WTForms-Alchemy , simple_form 

Authentication & Authorization policy Clear separation between Authorization and Authentication Powerfull ACL Resource Tree dependency Or build your own 

Config Imperative configuration or .ini file for non dev colleagues or even ZCML(XML) .ini file can support to serve multi wsgi app (paste legacy) 

Python Package friendly Application ready to package (egg, wheel, deb,..) or to distribute 

Interrested in Pyramid? Have a chat. Check the doc, tutorial. Come to the Pyramid London Meetup. 

A Final Word Frameworks are just tools. Use the ones which make you happy to code.