SlideShare a Scribd company logo
1 of 26
Download to read offline
12 tips on Django Best Practices
David Arcos
catchoom.com | @catchoom
12 tips on Django Best Practices
Some (personal) suggestions on:
- Development
- Deployment
- External tools

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Hi! I'm David Arcos
- Python/Django developer
- discovered Django in 2007 (v0.96)
- professionally since 2008

- Web backend, distributed systems,
databases, scalability, security
- Team leader at Catchoom

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices

- Image Recognition SaaS
- Top recognition results, shortest response times
- Easy to integrate into your apps/services

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Why Python? PEP 20, The Zen of Python:
- “Beautiful is better than ugly”
- “Simple is better than complex”
- “Complex is better than complicated”
- “Readability counts”
- “Special cases aren't special enough to break the rules”
- “If the implementation is hard to explain, it's a bad idea”
- (…)
http://www.python.org/dev/peps/pep-0020/

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Why Django?
- "The Web framework for perfectionists with deadlines"
- Django design philosophy:

- loose coupling, less code, DRY, consistency, etc...
- https://docs.djangoproject.com/en/dev/misc/design-philosophies/

- technically: tons of django apps, very good doc

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Virtualenv:
- “one project, one virtualenv”
- projects with different dependencies, package versions
- easier to deploy. Forget dependency hell!
- virtualenvwrapper is a convenient tool

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Dependencies:
- use pip:
pip install catchoom
- save the dependencies in a requirements.txt file:
pip freeze > requirements.txt
pip install -r requirements.txt
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Layout: projects and apps
- project = the full website. app = python library
repository/
|-- doc
`-- project
|-- apps
|
|-- app1
|
|-- app2
|
`-- app3
`-- settings
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices

- use short, obvious, single-word names for your apps
- many small apps is better than a few giant apps:
- explain an app in a sentence. If you can't, split the app
- rather than expand an app, write a new app
- don't reinvent the wheel!
- django.contrib
- 3rd-party apps
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Settings:
- multiple settings files:
- per environment: dev, testing, staging, production
- per developer (local settings, use the hostname)
- all settings files must inherit from base, so you can do:
INSTALLED_APPS += ('debug_toolbar', )

- version control all the settings!
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Django is a MTV framework
- Model (app/models.py)
- Template (app/templates/*.html)
- View (app/views.py)

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Fat models, thin views...
- logic should go to the models (and forms, signals...)
- keep the views at a minimum
Good example: django.contrib.auth.models.User

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices

- why? Because of maintainability!
- a model is much easier to test
- reusable logic: form validation, signals, etc
- the code becomes clearer, more self-documenting

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
...and stupid templates!
- your template layer should be as thin as possible
- (by design) django templates are limited, constrained
- doesn't fit your use case? Use jinja2 in those views
- Hey, but I get ugly generated HTML!
- doesn't matter, you want maintainable templates

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Deployment:
- web server:
- Nginx + gunicorn
- Supervisord to keep it alive.
- static server:
- Nginx. Or any CDN.
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Fabric:
"a library and command-line tool for streamlining the use of SSH for
application deployment or systems administration tasks"

- to automate deployments, migrations, execute
management commands, monitoring...
- no more repetitive maintainance tasks done manually!

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
South:
"intelligent schema and data migrations for Django projects"

- creates migration files automatically.
- You can still do changes
- can do backward migrations
- will avoid disasters. Use it!
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Celery:
"asynchronous task queue/job queue based on distributed message passing"

- execute tasks asynchronously, in a pool workers
- cpu-intensive or I/O-intensive tasks:
- emails, pdfs, thumbnails, crawling, requests...
- Celery needs a Message Queue
- Instead of RabbitMQ, try Redis.
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Redis:
"An advanced key-value store. It is often referred to as a data structure
server since keys can contain strings, hashes, lists, sets and sorted sets."

- store ephemeral data (active sessions)
- general cache (memcached compatible)
- real-time calculations: stats, monitoring, throttling...
- messages: channels (pub-sub), lists (push/blpop)
- indexes/filters (“sort by hits”)
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Sentry:
"realtime event logging and aggregation platform"
- monitor errors, get all the info to do a post-mortem
- uses the Python logger, easy to configure
- deploy a Sentry instance
- or use getsentry.com
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Debugging:
- ipython (already in ./manage.py shell)
- ipdb

import ipdb
ipdb.set_trace()

- django-debug-toolbar
- very powerful
- use it to optimize db performance, view by view
David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices
Summary:
- follow the Django philosophy (when possible)
- stand on the shoulder of giants: use existing apps

David Arcos | @DZPM

Catchoom | http://catchoom.com
12 tips on Django Best Practices

Thanks for attending!
- http://slideshare.net/DZPM
- Questions?

David Arcos | @DZPM

Catchoom | http://catchoom.com
Questions?

catchoom.com | @catchoom
12 tips on Django Best Practices

Thanks for attending!
- http://slideshare.net/DZPM

David Arcos | @DZPM

Catchoom | http://catchoom.com

More Related Content

What's hot

Introduction Django
Introduction DjangoIntroduction Django
Introduction DjangoWade Austin
 
Django - Python MVC Framework
Django - Python MVC FrameworkDjango - Python MVC Framework
Django - Python MVC FrameworkBala Kumar
 
Web development with django - Basics Presentation
Web development with django - Basics PresentationWeb development with django - Basics Presentation
Web development with django - Basics PresentationShrinath Shenoy
 
Django Framework Overview forNon-Python Developers
Django Framework Overview forNon-Python DevelopersDjango Framework Overview forNon-Python Developers
Django Framework Overview forNon-Python DevelopersRosario Renga
 
Introduction to Django
Introduction to DjangoIntroduction to Django
Introduction to DjangoKnoldus Inc.
 
Introduction to django
Introduction to djangoIntroduction to django
Introduction to djangoIlian Iliev
 
Web application development with Django framework
Web application development with Django frameworkWeb application development with Django framework
Web application development with Django frameworkflapiello
 
Python Django tutorial | Getting Started With Django | Web Development With D...
Python Django tutorial | Getting Started With Django | Web Development With D...Python Django tutorial | Getting Started With Django | Web Development With D...
Python Django tutorial | Getting Started With Django | Web Development With D...Edureka!
 
Django, What is it, Why is it cool?
Django, What is it, Why is it cool?Django, What is it, Why is it cool?
Django, What is it, Why is it cool?Tom Brander
 
The effective use of Django ORM
The effective use of Django ORMThe effective use of Django ORM
The effective use of Django ORMYaroslav Muravskyi
 
Django Tutorial | Django Web Development With Python | Django Training and Ce...
Django Tutorial | Django Web Development With Python | Django Training and Ce...Django Tutorial | Django Web Development With Python | Django Training and Ce...
Django Tutorial | Django Web Development With Python | Django Training and Ce...Edureka!
 
The Future Of Web Frameworks
The Future Of Web FrameworksThe Future Of Web Frameworks
The Future Of Web FrameworksMatt Raible
 
Django nutshell overview
Django nutshell overviewDjango nutshell overview
Django nutshell overviewschacki
 

What's hot (20)

Introduction Django
Introduction DjangoIntroduction Django
Introduction Django
 
Django - Python MVC Framework
Django - Python MVC FrameworkDjango - Python MVC Framework
Django - Python MVC Framework
 
Web development with django - Basics Presentation
Web development with django - Basics PresentationWeb development with django - Basics Presentation
Web development with django - Basics Presentation
 
Django
DjangoDjango
Django
 
Django Framework Overview forNon-Python Developers
Django Framework Overview forNon-Python DevelopersDjango Framework Overview forNon-Python Developers
Django Framework Overview forNon-Python Developers
 
Introduction to Django
Introduction to DjangoIntroduction to Django
Introduction to Django
 
Introduction to django
Introduction to djangoIntroduction to django
Introduction to django
 
Web application development with Django framework
Web application development with Django frameworkWeb application development with Django framework
Web application development with Django framework
 
Python/Django Training
Python/Django TrainingPython/Django Training
Python/Django Training
 
Django Girls Tutorial
Django Girls TutorialDjango Girls Tutorial
Django Girls Tutorial
 
Django
DjangoDjango
Django
 
Python Django tutorial | Getting Started With Django | Web Development With D...
Python Django tutorial | Getting Started With Django | Web Development With D...Python Django tutorial | Getting Started With Django | Web Development With D...
Python Django tutorial | Getting Started With Django | Web Development With D...
 
Django, What is it, Why is it cool?
Django, What is it, Why is it cool?Django, What is it, Why is it cool?
Django, What is it, Why is it cool?
 
django
djangodjango
django
 
The effective use of Django ORM
The effective use of Django ORMThe effective use of Django ORM
The effective use of Django ORM
 
Introduction to Django Rest Framework
Introduction to Django Rest FrameworkIntroduction to Django Rest Framework
Introduction to Django Rest Framework
 
Django Tutorial | Django Web Development With Python | Django Training and Ce...
Django Tutorial | Django Web Development With Python | Django Training and Ce...Django Tutorial | Django Web Development With Python | Django Training and Ce...
Django Tutorial | Django Web Development With Python | Django Training and Ce...
 
Rest api with Python
Rest api with PythonRest api with Python
Rest api with Python
 
The Future Of Web Frameworks
The Future Of Web FrameworksThe Future Of Web Frameworks
The Future Of Web Frameworks
 
Django nutshell overview
Django nutshell overviewDjango nutshell overview
Django nutshell overview
 

Similar to 12 tips on Django Best Practices

Decrease build time and application size
Decrease build time and application sizeDecrease build time and application size
Decrease build time and application sizeKeval Patel
 
There is something about serverless
There is something about serverlessThere is something about serverless
There is something about serverlessgjdevos
 
2019 StartIT - Boosting your performance with Blackfire
2019 StartIT - Boosting your performance with Blackfire2019 StartIT - Boosting your performance with Blackfire
2019 StartIT - Boosting your performance with BlackfireMarko Mitranić
 
NoSQL matters in Catchoom Recognition Service
NoSQL matters in Catchoom Recognition ServiceNoSQL matters in Catchoom Recognition Service
NoSQL matters in Catchoom Recognition ServiceCatchoom
 
Creating Developer-Friendly Docker Containers with Chaperone
Creating Developer-Friendly Docker Containers with ChaperoneCreating Developer-Friendly Docker Containers with Chaperone
Creating Developer-Friendly Docker Containers with ChaperoneGary Wisniewski
 
Serverless? How (not) to develop, deploy and operate serverless applications.
Serverless? How (not) to develop, deploy and operate serverless applications.Serverless? How (not) to develop, deploy and operate serverless applications.
Serverless? How (not) to develop, deploy and operate serverless applications.gjdevos
 
Version Control in Machine Learning + AI (Stanford)
Version Control in Machine Learning + AI (Stanford)Version Control in Machine Learning + AI (Stanford)
Version Control in Machine Learning + AI (Stanford)Anand Sampat
 
Web Development in Django
Web Development in DjangoWeb Development in Django
Web Development in DjangoLakshman Prasad
 
Scalable Django Architecture
Scalable Django ArchitectureScalable Django Architecture
Scalable Django ArchitectureRami Sayar
 
Make Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speedMake Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speedPromet Source
 
Cache all the things #DCLondon
Cache all the things #DCLondonCache all the things #DCLondon
Cache all the things #DCLondondigital006
 
The Mysteries Of JavaScript-Fu (@media SF Edition)
The Mysteries Of JavaScript-Fu (@media SF Edition)The Mysteries Of JavaScript-Fu (@media SF Edition)
The Mysteries Of JavaScript-Fu (@media SF Edition)danwrong
 
SaltConf14 - Thomas Jackson, LinkedIn - Safety with Power Tools
SaltConf14 - Thomas Jackson, LinkedIn - Safety with Power ToolsSaltConf14 - Thomas Jackson, LinkedIn - Safety with Power Tools
SaltConf14 - Thomas Jackson, LinkedIn - Safety with Power ToolsSaltStack
 
Background Processing - PyCon MY 2015
Background Processing - PyCon MY 2015Background Processing - PyCon MY 2015
Background Processing - PyCon MY 2015Kok Hoor Chew
 
Improving Drupal Performances
Improving Drupal PerformancesImproving Drupal Performances
Improving Drupal PerformancesVladimir Ilic
 
Get to know the browser better and write faster web apps
Get to know the browser better   and write faster web appsGet to know the browser better   and write faster web apps
Get to know the browser better and write faster web appsLior Bar-On
 
Make Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speedMake Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speedAndy Kucharski
 

Similar to 12 tips on Django Best Practices (20)

Decrease build time and application size
Decrease build time and application sizeDecrease build time and application size
Decrease build time and application size
 
There is something about serverless
There is something about serverlessThere is something about serverless
There is something about serverless
 
2019 StartIT - Boosting your performance with Blackfire
2019 StartIT - Boosting your performance with Blackfire2019 StartIT - Boosting your performance with Blackfire
2019 StartIT - Boosting your performance with Blackfire
 
NoSQL matters in Catchoom Recognition Service
NoSQL matters in Catchoom Recognition ServiceNoSQL matters in Catchoom Recognition Service
NoSQL matters in Catchoom Recognition Service
 
Creating Developer-Friendly Docker Containers with Chaperone
Creating Developer-Friendly Docker Containers with ChaperoneCreating Developer-Friendly Docker Containers with Chaperone
Creating Developer-Friendly Docker Containers with Chaperone
 
Serverless? How (not) to develop, deploy and operate serverless applications.
Serverless? How (not) to develop, deploy and operate serverless applications.Serverless? How (not) to develop, deploy and operate serverless applications.
Serverless? How (not) to develop, deploy and operate serverless applications.
 
Introduce Django
Introduce DjangoIntroduce Django
Introduce Django
 
Version Control in Machine Learning + AI (Stanford)
Version Control in Machine Learning + AI (Stanford)Version Control in Machine Learning + AI (Stanford)
Version Control in Machine Learning + AI (Stanford)
 
Web Development in Django
Web Development in DjangoWeb Development in Django
Web Development in Django
 
Scalable Django Architecture
Scalable Django ArchitectureScalable Django Architecture
Scalable Django Architecture
 
Make Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speedMake Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speed
 
Cache all the things #DCLondon
Cache all the things #DCLondonCache all the things #DCLondon
Cache all the things #DCLondon
 
The Mysteries Of JavaScript-Fu (@media SF Edition)
The Mysteries Of JavaScript-Fu (@media SF Edition)The Mysteries Of JavaScript-Fu (@media SF Edition)
The Mysteries Of JavaScript-Fu (@media SF Edition)
 
SaltConf14 - Thomas Jackson, LinkedIn - Safety with Power Tools
SaltConf14 - Thomas Jackson, LinkedIn - Safety with Power ToolsSaltConf14 - Thomas Jackson, LinkedIn - Safety with Power Tools
SaltConf14 - Thomas Jackson, LinkedIn - Safety with Power Tools
 
Background Processing - PyCon MY 2015
Background Processing - PyCon MY 2015Background Processing - PyCon MY 2015
Background Processing - PyCon MY 2015
 
NYC_2016_slides
NYC_2016_slidesNYC_2016_slides
NYC_2016_slides
 
Improving Drupal Performances
Improving Drupal PerformancesImproving Drupal Performances
Improving Drupal Performances
 
Scaling PHP apps
Scaling PHP appsScaling PHP apps
Scaling PHP apps
 
Get to know the browser better and write faster web apps
Get to know the browser better   and write faster web appsGet to know the browser better   and write faster web apps
Get to know the browser better and write faster web apps
 
Make Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speedMake Drupal Run Fast - increase page load speed
Make Drupal Run Fast - increase page load speed
 

Recently uploaded

Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™Adtran
 
Crea il tuo assistente AI con lo Stregatto (open source python framework)
Crea il tuo assistente AI con lo Stregatto (open source python framework)Crea il tuo assistente AI con lo Stregatto (open source python framework)
Crea il tuo assistente AI con lo Stregatto (open source python framework)Commit University
 
Introduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptxIntroduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptxMatsuo Lab
 
Videogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdfVideogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdfinfogdgmi
 
NIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 WorkshopNIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 WorkshopBachir Benyammi
 
Cybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxCybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxGDSC PJATK
 
9 Steps For Building Winning Founding Team
9 Steps For Building Winning Founding Team9 Steps For Building Winning Founding Team
9 Steps For Building Winning Founding TeamAdam Moalla
 
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCostKubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCostMatt Ray
 
UiPath Studio Web workshop series - Day 8
UiPath Studio Web workshop series - Day 8UiPath Studio Web workshop series - Day 8
UiPath Studio Web workshop series - Day 8DianaGray10
 
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfUiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfDianaGray10
 
Comparing Sidecar-less Service Mesh from Cilium and Istio
Comparing Sidecar-less Service Mesh from Cilium and IstioComparing Sidecar-less Service Mesh from Cilium and Istio
Comparing Sidecar-less Service Mesh from Cilium and IstioChristian Posta
 
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationUsing IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationIES VE
 
Empowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership BlueprintEmpowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership BlueprintMahmoud Rabie
 
Machine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfMachine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfAijun Zhang
 
Bird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystemBird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystemAsko Soukka
 
Linked Data in Production: Moving Beyond Ontologies
Linked Data in Production: Moving Beyond OntologiesLinked Data in Production: Moving Beyond Ontologies
Linked Data in Production: Moving Beyond OntologiesDavid Newbury
 
Computer 10: Lesson 10 - Online Crimes and Hazards
Computer 10: Lesson 10 - Online Crimes and HazardsComputer 10: Lesson 10 - Online Crimes and Hazards
Computer 10: Lesson 10 - Online Crimes and HazardsSeth Reyes
 
Artificial Intelligence & SEO Trends for 2024
Artificial Intelligence & SEO Trends for 2024Artificial Intelligence & SEO Trends for 2024
Artificial Intelligence & SEO Trends for 2024D Cloud Solutions
 
Designing A Time bound resource download URL
Designing A Time bound resource download URLDesigning A Time bound resource download URL
Designing A Time bound resource download URLRuncy Oommen
 
IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019
IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019
IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019IES VE
 

Recently uploaded (20)

Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™
 
Crea il tuo assistente AI con lo Stregatto (open source python framework)
Crea il tuo assistente AI con lo Stregatto (open source python framework)Crea il tuo assistente AI con lo Stregatto (open source python framework)
Crea il tuo assistente AI con lo Stregatto (open source python framework)
 
Introduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptxIntroduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptx
 
Videogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdfVideogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdf
 
NIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 WorkshopNIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 Workshop
 
Cybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxCybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptx
 
9 Steps For Building Winning Founding Team
9 Steps For Building Winning Founding Team9 Steps For Building Winning Founding Team
9 Steps For Building Winning Founding Team
 
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCostKubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
 
UiPath Studio Web workshop series - Day 8
UiPath Studio Web workshop series - Day 8UiPath Studio Web workshop series - Day 8
UiPath Studio Web workshop series - Day 8
 
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfUiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
 
Comparing Sidecar-less Service Mesh from Cilium and Istio
Comparing Sidecar-less Service Mesh from Cilium and IstioComparing Sidecar-less Service Mesh from Cilium and Istio
Comparing Sidecar-less Service Mesh from Cilium and Istio
 
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationUsing IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
 
Empowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership BlueprintEmpowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership Blueprint
 
Machine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfMachine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdf
 
Bird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystemBird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystem
 
Linked Data in Production: Moving Beyond Ontologies
Linked Data in Production: Moving Beyond OntologiesLinked Data in Production: Moving Beyond Ontologies
Linked Data in Production: Moving Beyond Ontologies
 
Computer 10: Lesson 10 - Online Crimes and Hazards
Computer 10: Lesson 10 - Online Crimes and HazardsComputer 10: Lesson 10 - Online Crimes and Hazards
Computer 10: Lesson 10 - Online Crimes and Hazards
 
Artificial Intelligence & SEO Trends for 2024
Artificial Intelligence & SEO Trends for 2024Artificial Intelligence & SEO Trends for 2024
Artificial Intelligence & SEO Trends for 2024
 
Designing A Time bound resource download URL
Designing A Time bound resource download URLDesigning A Time bound resource download URL
Designing A Time bound resource download URL
 
IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019
IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019
IESVE Software for Florida Code Compliance Using ASHRAE 90.1-2019
 

12 tips on Django Best Practices

  • 1. 12 tips on Django Best Practices David Arcos catchoom.com | @catchoom
  • 2. 12 tips on Django Best Practices Some (personal) suggestions on: - Development - Deployment - External tools David Arcos | @DZPM Catchoom | http://catchoom.com
  • 3. 12 tips on Django Best Practices Hi! I'm David Arcos - Python/Django developer - discovered Django in 2007 (v0.96) - professionally since 2008 - Web backend, distributed systems, databases, scalability, security - Team leader at Catchoom David Arcos | @DZPM Catchoom | http://catchoom.com
  • 4. 12 tips on Django Best Practices - Image Recognition SaaS - Top recognition results, shortest response times - Easy to integrate into your apps/services David Arcos | @DZPM Catchoom | http://catchoom.com
  • 5. 12 tips on Django Best Practices Why Python? PEP 20, The Zen of Python: - “Beautiful is better than ugly” - “Simple is better than complex” - “Complex is better than complicated” - “Readability counts” - “Special cases aren't special enough to break the rules” - “If the implementation is hard to explain, it's a bad idea” - (…) http://www.python.org/dev/peps/pep-0020/ David Arcos | @DZPM Catchoom | http://catchoom.com
  • 6. 12 tips on Django Best Practices Why Django? - "The Web framework for perfectionists with deadlines" - Django design philosophy: - loose coupling, less code, DRY, consistency, etc... - https://docs.djangoproject.com/en/dev/misc/design-philosophies/ - technically: tons of django apps, very good doc David Arcos | @DZPM Catchoom | http://catchoom.com
  • 7. 12 tips on Django Best Practices Virtualenv: - “one project, one virtualenv” - projects with different dependencies, package versions - easier to deploy. Forget dependency hell! - virtualenvwrapper is a convenient tool David Arcos | @DZPM Catchoom | http://catchoom.com
  • 8. 12 tips on Django Best Practices Dependencies: - use pip: pip install catchoom - save the dependencies in a requirements.txt file: pip freeze > requirements.txt pip install -r requirements.txt David Arcos | @DZPM Catchoom | http://catchoom.com
  • 9. 12 tips on Django Best Practices Layout: projects and apps - project = the full website. app = python library repository/ |-- doc `-- project |-- apps | |-- app1 | |-- app2 | `-- app3 `-- settings David Arcos | @DZPM Catchoom | http://catchoom.com
  • 10. 12 tips on Django Best Practices - use short, obvious, single-word names for your apps - many small apps is better than a few giant apps: - explain an app in a sentence. If you can't, split the app - rather than expand an app, write a new app - don't reinvent the wheel! - django.contrib - 3rd-party apps David Arcos | @DZPM Catchoom | http://catchoom.com
  • 11. 12 tips on Django Best Practices Settings: - multiple settings files: - per environment: dev, testing, staging, production - per developer (local settings, use the hostname) - all settings files must inherit from base, so you can do: INSTALLED_APPS += ('debug_toolbar', ) - version control all the settings! David Arcos | @DZPM Catchoom | http://catchoom.com
  • 12. 12 tips on Django Best Practices Django is a MTV framework - Model (app/models.py) - Template (app/templates/*.html) - View (app/views.py) David Arcos | @DZPM Catchoom | http://catchoom.com
  • 13. 12 tips on Django Best Practices Fat models, thin views... - logic should go to the models (and forms, signals...) - keep the views at a minimum Good example: django.contrib.auth.models.User David Arcos | @DZPM Catchoom | http://catchoom.com
  • 14. 12 tips on Django Best Practices - why? Because of maintainability! - a model is much easier to test - reusable logic: form validation, signals, etc - the code becomes clearer, more self-documenting David Arcos | @DZPM Catchoom | http://catchoom.com
  • 15. 12 tips on Django Best Practices ...and stupid templates! - your template layer should be as thin as possible - (by design) django templates are limited, constrained - doesn't fit your use case? Use jinja2 in those views - Hey, but I get ugly generated HTML! - doesn't matter, you want maintainable templates David Arcos | @DZPM Catchoom | http://catchoom.com
  • 16. 12 tips on Django Best Practices Deployment: - web server: - Nginx + gunicorn - Supervisord to keep it alive. - static server: - Nginx. Or any CDN. David Arcos | @DZPM Catchoom | http://catchoom.com
  • 17. 12 tips on Django Best Practices Fabric: "a library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks" - to automate deployments, migrations, execute management commands, monitoring... - no more repetitive maintainance tasks done manually! David Arcos | @DZPM Catchoom | http://catchoom.com
  • 18. 12 tips on Django Best Practices South: "intelligent schema and data migrations for Django projects" - creates migration files automatically. - You can still do changes - can do backward migrations - will avoid disasters. Use it! David Arcos | @DZPM Catchoom | http://catchoom.com
  • 19. 12 tips on Django Best Practices Celery: "asynchronous task queue/job queue based on distributed message passing" - execute tasks asynchronously, in a pool workers - cpu-intensive or I/O-intensive tasks: - emails, pdfs, thumbnails, crawling, requests... - Celery needs a Message Queue - Instead of RabbitMQ, try Redis. David Arcos | @DZPM Catchoom | http://catchoom.com
  • 20. 12 tips on Django Best Practices Redis: "An advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets." - store ephemeral data (active sessions) - general cache (memcached compatible) - real-time calculations: stats, monitoring, throttling... - messages: channels (pub-sub), lists (push/blpop) - indexes/filters (“sort by hits”) David Arcos | @DZPM Catchoom | http://catchoom.com
  • 21. 12 tips on Django Best Practices Sentry: "realtime event logging and aggregation platform" - monitor errors, get all the info to do a post-mortem - uses the Python logger, easy to configure - deploy a Sentry instance - or use getsentry.com David Arcos | @DZPM Catchoom | http://catchoom.com
  • 22. 12 tips on Django Best Practices Debugging: - ipython (already in ./manage.py shell) - ipdb import ipdb ipdb.set_trace() - django-debug-toolbar - very powerful - use it to optimize db performance, view by view David Arcos | @DZPM Catchoom | http://catchoom.com
  • 23. 12 tips on Django Best Practices Summary: - follow the Django philosophy (when possible) - stand on the shoulder of giants: use existing apps David Arcos | @DZPM Catchoom | http://catchoom.com
  • 24. 12 tips on Django Best Practices Thanks for attending! - http://slideshare.net/DZPM - Questions? David Arcos | @DZPM Catchoom | http://catchoom.com
  • 26. 12 tips on Django Best Practices Thanks for attending! - http://slideshare.net/DZPM David Arcos | @DZPM Catchoom | http://catchoom.com