Gilson Filho gilsondev

Provider	Singleton	Instantiable	Configurable
Constant	Yes	No	No
Value	Yes	No	No
Service	Yes	No	No
Factory	Yes	Yes	No
Decorator	Yes	No?	No
Provider	Yes	Yes	Yes

Constant

Workflows (States) in Django

I'm going to cover a simple, but effective, utility for managing state and transitions (aka workflow). We often need to store the state (status) of a model and it should only be in one state at a time.

Common Software Uses

Publishing (Draft->Approved->Published->Expired->Deleted)

	import argparse
	import re
	from multiprocessing.pool import ThreadPool as Pool
	import requests
	import bs4

	root_url = 'http://pyvideo.org'
	index_url = root_url + '/category/50/pycon-us-2014'

	#################
	# Validate Args #
	#################
	if [ "$#" -ne 2 ]; then
	echo "Usage: $0 FQDN EMAIL"
	exit 1
	fi


	# Postfix

	#!/bin/zsh
	#
	# Highlight a given file and copy it as RTF.
	#
	# Simon Olofsson <[email protected]>
	#

	set -o errexit
	set -o nounset

	<select name="estados-brasil">
	<option value="AC">Acre</option>
	<option value="AL">Alagoas</option>
	<option value="AP">Amapá</option>
	<option value="AM">Amazonas</option>
	<option value="BA">Bahia</option>
	<option value="CE">Ceará</option>
	<option value="DF">Distrito Federal</option>
	<option value="ES">Espírito Santo</option>
	<option value="GO">Goiás</option>

	from django.contrib import admin
	from django.contrib.auth.admin import UserAdmin
	from django.contrib.auth.models import User


	class UserAdmin(admin.ModelAdmin):
	list_display = ('email', 'first_name', 'last_name')
	list_filter = ('is_staff', 'is_superuser')
	search_fields = ('email',)

	from uuid import UUID

	def validate_uuid4(uuid_string):

	"""
	Validate that a UUID string is in
	fact a valid uuid4.

	Happily, the uuid module does the actual
	checking for us.

	import base64

	from django.core.files.base import ContentFile
	from rest_framework import serializers


	class Base64ImageField(serializers.ImageField):
	def from_native(self, data):
	if isinstance(data, basestring) and data.startswith('data:image'):
	# base64 encoded image - decode

	<!DOCTYPE html>
	<html data-ng-app="webapp">

	<head>
	<title>angular nav</title>
	<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
	<style>
	body{
	padding-top: 70px;
	}