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@donrokzon
donrokzon / django.py
Last active June 3, 2018 14:36
Django
mkdir tutorial
cd tutorial
# Create a virtualenv to isolate our package dependencies locally
virtualenv env
source env/bin/activate # On Windows use `env\Scripts\activate`
# Install Django and Django REST framework into the virtualenv
pip install django
pip install djangorestframework
@tinvaan
tinvaan / models.py
Created June 3, 2018 14:12
Code snippet to demonstrate how a Django model can be made immutable on certain condition. Hint : Override the save() method for the model in question.
from django.db import models
from django.utils import timezone
class Bank(models.Model):
bank_ifsc = models.CharField(max_length=200, blank=False, primary_key=True)
bank_name = models.CharField(max_length=200, blank=False)
bank_addr = models.CharField(max_length=400, blank=True)
def __str__(self):
@gaearon
gaearon / modern_js.md
Last active March 31, 2026 02:55
Modern JavaScript in React Documentation

If you haven’t worked with JavaScript in the last few years, these three points should give you enough knowledge to feel comfortable reading the React documentation:

  • We define variables with let and const statements. For the purposes of the React documentation, you can consider them equivalent to var.
  • We use the class keyword to define JavaScript classes. There are two things worth remembering about them. Firstly, unlike with objects, you don't need to put commas between class method definitions. Secondly, unlike many other languages with classes, in JavaScript the value of this in a method [depends on how it is called](https://developer.mozilla.org/en-US/docs/Web/Jav