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title:Beginner's Workshop 5
Author: Alexander Loechel
event:PyLadies Munich - Beginner's Workshop - Web Development
keywords:Python, PyLadies, Workshop
data-transition-duration:1500
css-all:css/workshop3.css
auto-console:Yes
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Welcome to

images/pyladies-munich.png

Beginner's workshop 5

Web Development

Note

  • Test Note
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Recap Workshop 1-4

  • What is Python
  • Setup & Tools
  • Theory
id:intro-pyramid
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Web Development with Pyramid

images/pyramid-logo.png

id:step1-setup
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Step 1: Setup environment

  • Install Python 3.4
  • Check Python:
$ python3 -V
Python 3.4.x
  • Setup a Virtual Environment:
$ pyvenv trypyramid
$ cd trypyramid
$ source bin/activate
  • Install Pyramid Web Framework
$ pip install pyramid
id:step2-one-file-app
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Step 2: One File Pyramid App
Hello World

Write this into a file app.py:

 1 from wsgiref.simple_server import make_server
 2 from pyramid.config import Configurator
 3 from pyramid.response import Response
 4 
 5 def hello(request):
 6     return Response('Hello world!')
 7 
 8 if __name__ == '__main__':
 9     config = Configurator()
10     config.add_route('hello_world', '/')
11     config.add_view(hello, route_name='hello_world')
12     app = config.make_wsgi_app()
13     server = make_server('0.0.0.0', 8080, app)
14     server.serve_forever()

http://trypyramid.com/

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Step 3: Start the app

$ python app.py

Open http://127.0.0.1:8080/ in Browser

Output: Hello World!

id:one-file-app
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Explanation of "One File Pyramid App"

 1 # framework imports
 2 from wsgiref.simple_server import make_server
 3 from pyramid.config import Configurator
 4 from pyramid.response import Response
 5 
 6 # hello view on route 'hello_world'
 7 def hello(request):
 8     return Response('Hello world!')
 9 
10 # Base call on file
11 if __name__ == '__main__':
12     # Base Configuration
13     config = Configurator()
14     config.add_route('hello_world', '/')
15     config.add_view(hello, route_name='hello_world')
16 
17     # Building and starting the app
18     app = config.make_wsgi_app()
19     server = make_server('0.0.0.0', 8080, app)
20     server.serve_forever()
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Excurses

  • Philosophy
    • Be lazy - Don't repeat yourself - Don't reinvent the wheel
    • Standing on the shoulders of giants
    • Test Driven Development & Documentation
  • Tools
    • git
    • Python Eggs
id:phil
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Philosophy
three great virtues of a programmer

  • Laziness: The quality that makes you go to great effort to reduce overall energy expenditure. It makes you write labor-saving programs that other people will find useful and document what you wrote so you don't have to answer so many questions about it.
  • Impatience: The anger you feel when the computer is being lazy. This makes you write programs that don't just react to your needs, but actually anticipate them. Or at least pretend to.
  • Hubris: The quality that makes you write (and maintain) programs that other people won't want to say bad things about.

—"Programming Perl", Larry Wall, 2nd Edition, O'Reilly, 1996

id:dry
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Philosophy
DRY - Don't repeat yourself

Don't repeat yourself

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

—Andy Hunt, Dave Thomas; The Pragmatic Programmer

DRY vs WET

  • DRY: Don't repeat yourself
  • WET: write everything twice / we enjoy typing

It applies for one program and also to best practice of frameworks

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Philosophy
Don't reinvent the wheel

To reinvent the wheel is to duplicate a basic method that has already previously been created or optimized by others.
  • Why should I write and maintain code that others alrady have developed
  • Using Best practices
  • Standing on the shoulders of giants - we don't have to reinvent the wheel, we use it
id:tests
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Test Driven Development & Documentation

  • Specification
  • Testing of Specification
  • Documentation
id:git
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Tool: GIT

git: a distributed version control system

  • git init
  • git clone url
  • git status
  • git add
  • git rm
  • git commit
  • git checkout
  • git branch
  • git push
id:eggs
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Python Eggs/Wheels

Eggs/Wheels are the Python Packaging Container

id:scaffolds
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Scaffolds / Templates / Skeletons

Concept of Code Generation to bootstrap software components

id:normal-pyramid-app
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Starting a Pyramid App

Steps:

  1. Virtual Environment (pyvenv)
  2. install pyramid
  3. use scaffold to create base app / egg structure
  4. check into VCS
  5. start app in development mode and start developing
id:venv
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Virtual Environment

$ pyvenv base_app
$ cd base_app
$ source bin/activate

Install Pyramid

$ pip install pyramid
id:bootstrap
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Bootstrap App with scaffold

# generate app from scaffold
# (for all avaliable scaffolds see: `pcreate --list`)
$ pcreate -s starter base_app
...
$ cd base_app

# Check generated Code into VCS
$ git init .
$ git add setup.py README.txt base_app/
$ git commit -m "initial version from scaffold"

# build app
$ python setup.py develop
id:start
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Start App

$ pserve --reload development.ini
Starting subprocess with file monitor
Starting server in PID xxxx.
serving on http://0.0.0.0:6543

open http://127.0.0.1:6543/ in Browser

id:test_app
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Test App

$ python setup.py test
id:next-meeting
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Next Workshop

images/pyladies-munich.png

Thursday June 25th 2015 18:30

Web Development
Templating / Schema / Forms

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