Introduction to using Python and the web framework development Django.

1. Python and Django
A first taste

2. What is Python?
• General purpose, interpreted
• Supports procedural, object oriented, functional
paradigms
• Easy for newcomers

3. Python
Used in many application domains:
web development, gaming, animation, scientific
computing, robotics, spacecraft control, desktop
applications, testing microchips …
Google, Youtube, Disqus, Reddit, Dropbox, Disney,
Pixar, Nasa, Rasberry Pi, Intel …

4. Python philosophy
• Readable code
“Code is read much more often than it is written”
• Developer productivity, built-in toolset
Large standard library / third party libraries

5. Whitespace is important
if 1 < 2:
print 'Numbers behaving normally'
def my_function(a, b):
return a + b
my_function(2, 3)

6. Get up and running with
Python quickly
• Free online book: “Dive Into Python”
• Try out the interpreter

7. $ python
Python 2.7.6 (default, Sep 9 2014,
15:04:36)
[GCC 4.2.1 Compatible Apple LLVM 6.0
(clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or
"license" for more information.
>>>

8. >>> 5 + 4
9
>>> name = 'Ellen'
>>> print name
Ellen
>>>

9. Modules and Packages
import module
import package.module
PyPi - Python Package index. Over 56,000 packages
pip - python package manger
pip install package-name
pip install -r requirements.txt
pip freeze > requirements.txt

10. Virtual Machine
Develop in the same environment, on the same OS as
your web server
Virtual Environment
Keep the dependencies required by different projects
in separate places.

11. Debugging with pdb / ipdb
Interactive source code debugger
Supports
• stepping though code
• setting conditional breakpoints
• printing values
• evaluating python code
import ipdb
ipdb.set_trace()

12. Django
web development framework

13. Web development with
Django framework
MVC Django deals with
Models Models data
Controllers Views what you see
Views Templates how you see it

14. Django
• Reusable modules = ‘apps’
• ORM (Object-Relational Mapping)
• Templating
• Routing
• Forms library

15. Django Automatic Admin

16. • What python is and what it’s used for
• How to start with python
• Libraries - modules and packages
• Development environment
• Web development framework Django