pro-django-cisco.md

Resources for Pro Django students at Cisco

June 12-13, 2017

Tags and filters

• Built-in tags and filters

Regular Expressions

• Readable Regular Expressions - 3-hour tutorial

Class-Based Views

• Classy Class-Based Views
• Views can be classy! - Video presentation

Testing

• Obey the Testing Goat

Model Managers

• Docs
• Better Model Managers Through Custom Managers and Querysets - video

Signals

• Docs
• How to Create Django Signals tutorial

Data normalization and denormalization

• Wikipedia page on data normalization
• Wikipedia page on denormalizaton

Celery

• First Steps wth Django
• Next Steps with Celery

Django REST Framework

• Docs
• Tutorial
• Example by Kenny Yarboro with Slides - And an accompanying video

Functional Programming

• Functional Programming in Python - Free ebook

Security

• Making Django Really, Really, Ridiculously Secure - video

Queries

• F Expressions
• The Power of Django's Q Objects

Answers to Queries prompts

Retrieve all Question objects Question.objects.all()

Retrieve all Question objects that contain “favorite” Question.objects.filter(question_text__contains="favorite")

Retrieve all Question objects created in this month Question.objects.filter(pub_date__month=6)

Retrieve all Question objects except ones that contain “Which” Question.objects.all().exclude(question_text__contain="Which")

List all questions created yesterday

import datetime 
from django.utils import timezone 
time = timezone.now() + datetime.timedelta(days=-1)
Question.objects.filter(pub_date__gte=time)

List all questions you created: Question.objects.filter(owner__username="lacey")

How many questions did you create? Question.objects.filter(owner__username="lacey").count()

Total question: Question.objects.all().count()

Max date a question was created

from django.db.models import Max
Question.objects.all().aggregate(Max('pub_date'))

Create an annotation of the number of choices a question has

questions = Question.objects.annotate(num_choices=Count('choice'))
questions[0].num_choices

What is the max number of choices a question has? questions.aggregate(Max('num_choices'))

List Comprehensions

• Python List Comprehensions: Explained Visually