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Introduction To Django (+ py)

Adrian Andreiaș, Elvsofthttp://twitter.com/adiandreias

• Worked as software engineer (C++, C#)• Graduated UBB, Cluj in 2003• Founded Elvsoft in 2004• PHP, then switched to Python & Django• Currently internet hosting & tools

Shameless self promotion

1. Short look at Python2. Introduction To Django3. Django live coding: A Digg app

Summary

• interpreted, general-purpose high-level programming language

• design philosophy emphasizes code readability

• combine "remarkable power with very clear syntax“

• batteries included

Python goals

...

• Readability counts.• There should be one-- and preferably

only one --obvious way to do it....• If the implementation is hard to explain,

it's a bad idea.…

The Zen of Python

Python syntax

• dynamic typed• duck typed = name resolution (late

binding)“if it walks like a duck, and quacks like a duck, then it is a duck"

Python is

Fully:• object-oriented programming• structured programming

Elements of:• functional programming• aspect-oriented programming

Python paradigms

• (google) Python tutorial• (google) Dive Into Python

Learning Python

• The Web framework for perfectionists with deadlines

• Django makes it easier to build better Web apps more quickly and with less code.

Django is

• Loose coupling• Less code• Quick development• DRY (Don't Repeat Yourself)• Explicit is better than implicit• Consistency• Encourage best practices

Django philosophy

• Python developers should (mainly) write Python code (not YAML, XML, SQL)

• No generated code• Use introspection, Luke!• Web development done right:

• validations• separation of concerns• clean URLs• take care sql and mail form injections etc.

Some Django principles

• MTV instead of MVC• Models: Object-relational mapper• Template engine• Views: python functions, Request

in, Response out• URL mapping: list of regular

expressions

Django components

Models

urls.py

Views

Templates (with inheritance!)

• Automatic admin interface• Cache system• Internationalization• Authentication & authorization• Form processing and form sets

Django free stuff

Coding a DIGG app

Other questions?

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