Assuming Node, npm, nvm are all installed and updated. 1) npm init -y : Create the package.json file. 2) npm install typescript –save-dev : Install the typescript compiler 3) npx tsc –init: create tsconfig.json file Now we want to automate our *.ts transpilation into javascript. 4) npm install ts-node –save-dev : In package.json, under scripts: […]
I often want to see the actual SQL generated by the orm query. This is important especially if you are running some DML queries like update, select etc and want to ensure that generated sql is exactly what you had in mind. If the query results in a queryset, its really straight forward. goto ./manage.py […]
Let me start with an actual use case scenario. As a backend developer, I need to process the user uploaded file data all the time. Here temporary files shine. The best part about these is that they make cleanup easier. If you make a real file, you need to use some OS level utility to […]
I was trying to install psycopg2 database adapter for PostgreSQL on Ubuntu 18.04. And was always getting an error when doing “pipenv install psycopg2”, complaining about “Python.h” missing. After much head-scratching, I found the issue. Multiple Python distributions confuse psycopg2 installation. Its like this. psycopg2 has two main dependencies libpq-dev python3-dev. On Ubuntu, you install […]
This describes the basic overview of SQL Alchemy. Notice the color theme. It will be related to the next onion-ring overview of SQL Alchemy. SQL Alchemy is divided into Core and ORM. You can use Core and not use ORM. ORM is more geared towards mapping model objects to Python data types. Core on the […]
Celery is a task queue with focus on real-time processing, while also supporting task scheduling. RabbitMQ is a message broker. This means it handles the queue of “messages” between Django and Celery. Redis is a key-value based storage (REmote DIstributed Storage). Very fast. Used for results backend. Code for this tutorial is here: https://github.com/tek-shinobi/celeryDj Install […]
Descriptors are often overlooked part of Python. We are all aware of @property. Descriptors are what power it. So lets take a look at them. Why Descriptors Look at this code: class Person: def __init__(self, name): self._name = name @property def name(self): return self._name.capitalize() @name.setter def name(self, value): self._name = value @name.deleter def name(self): del […]
This is a general post about what mixins are. Mixins are a design pattern found in many languages. In Python, though the language does not support mixins natively,they are implemented using Python’s multiple inheritence model. The mixins are different from inheritence. Inheritence is useful when you want to narrow a scope in the inherited class. […]
This article is inspired by article here. What is Pytest Pytest is testing framework for Python. Very popular with Django. Killer feature : Fixtures Fixtures are the killer feature of Pytest. Fixtures are functions that run before and after each test, like setUp and tearDown in unitest and labelled pytest killer feature. Fixtures are used […]
See part 1 here. In this part we are discussing what to do when we add custom user model later in the project. Note that in this scenario, we are in a very non-ideal situation. To keep unknown surprises at the minimum, we will still delete old database but we will use the concept of […]