Introduction to Pylint-Django

Pylint-Django is a Pylint plugin that provides a variety of linting features specifically for Django projects. It helps maintain clean and error-free code by checking for various coding standards and common pitfalls. In this guide, we’ll explore dozens of useful APIs provided by Pylint-Django, complete with code snippets and practical examples.

Getting Started

To install Pylint-Django, run the following command:

pip install pylint-django

API Examples

Model Checks

Pylint-Django provides several checks for Django models:

from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=100)
    age = models.IntegerField()
    
    def __str__(self):
        return self.name

Common checks include:

• Ensuring fields have max_length specified.
• Checking for the presence of __str__ method.

View Checks

Pylint-Django also provides checks for views:

from django.shortcuts import render
from .models import Person

def person_detail(request, person_id):
    person = Person.objects.get(id=person_id)
    return render(request, 'person_detail.html', {'person': person})

This includes:

• Ensuring the view functions follow standard naming conventions.
• Checking for proper use of Django shortcuts like get_object_or_404.

Form Checks

Here’s an example of form checks:

from django import forms

class PersonForm(forms.ModelForm):
    class Meta:
        model = Person
        fields = ['name', 'age']

Some of the checks include:

• Ensuring Meta class is defined.
• Validating that all specified fields are present in the model.

Template Checks

Pylint-Django also checks for best practices in templates:

<!-- person_detail.html -->
<h1>{{ person.name }}</h1>
<p>Age: {{ person.age }}</p>

This includes checks like ensuring context variables are used correctly and that HTML syntax is valid.

Example Django App

Here is an example of a simple Django application using the introduced APIs:

# models.py
from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=100)
    age = models.IntegerField()

    def __str__(self):
        return self.name

# forms.py
from django import forms
from .models import Person

class PersonForm(forms.ModelForm):
    class Meta:
        model = Person
        fields = ['name', 'age']

# views.py
from django.shortcuts import render, get_object_or_404
from .models import Person
from .forms import PersonForm

def person_detail(request, person_id):
    person = get_object_or_404(Person, id=person_id)
    return render(request, 'person_detail.html', {'person': person})

def person_list(request):
    persons = Person.objects.all()
    return render(request, 'person_list.html', {'persons': persons})

# templates/person_detail.html
<h1>{{ person.name }}</h1>
<p>Age: {{ person.age }}</p>

# templates/person_list.html
<h1>Person List</h1>
<ul>
    {% for person in persons %}
        <li>{{ person.name }} - Age: {{ person.age }}</li>
    {% endfor %}
</ul>

By integrating Pylint-Django into your development workflow, you can ensure that your Django applications maintain a high standard of code quality and readability.

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