John CHANG-CHING-CHUNG

Installation

pip3 install --user pyqt5  
sudo apt-get install python3-pyqt5  
sudo apt-get install pyqt5-dev-tools
sudo apt-get install qttools5-dev-tools

Configuring to run from terminal

Reasonable default configuration for a web app that uses Django and the following dependencies:

Pipenv: Python package manager
Gunicorn: WSGI server
Nginx: Static webserver passing to gunicorn, handling SSL, etc.
Systemd: Used to load Gunicorn on startup

This is my goto for setting up projects.

Updating a feature branch

First we'll update your local master branch. Go to your local project and check out the branch you want to merge into (your local master branch)

$ git checkout master

Fetch the remote, bringing the branches and their commits from the remote repository. You can use the -p, --prune option to delete any remote-tracking references that no longer exist in the remote. Commits to master will be stored in a local branch, remotes/origin/master

Ubuntu 16 default python is almost python 3

Loads of solutions exist, but for changing the system default, alias is not the way to go.

$ update-alternatives --list python update-alternatives: error: no alternatives for python

psql: FATAL: Peer authentication failed for user “postgres” (or any user)

The connection failed because by default psql connects over UNIX sockets using peer authentication, that requires the current UNIX user to have the same user name as psql. So you will have to create the UNIX user postgres and then login as postgres or use sudo -u postgres psql database-name for accessing the database (and psql should not ask for a password).

If you cannot or do not want to create the UNIX user, like if you just want to connect to your database for ad hoc queries, forcing a socket connection using psql --host=localhost --dbname=database-name --username=postgres (as pointed out by @meyerson answer) will solve your immediate problem.

But if you intend to force password authentication over Unix sockets instead of the peer method, try changing the following pg_hba.conf* line:

from

VSCode Shortcuts

List of helpful shortcuts for faster coding

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Official List of all commands

Windows
Mac

	def patch_geos_signatures():
	"""
	Patch GEOS to function on macOS arm64 and presumably
	other odd architectures by ensuring that call signatures
	are explicit, and that Django 4 bugfixes are backported.

	Should work on Django 2.2+, minimally tested, caveat emptor.
	"""
	import logging

	<!doctype html>
	<html lang="en">
	<body>
	<span id="output"></span>
	</body>
	<script>
	(function () {
	var workerBlob = new Blob(
	[workerRunner.toString().replace(/^function .+\{?\|\}$/g, '')],
	{ type:'text/javascript' }

	if [ ! -f .env ]
	then
	export $(cat .env \| xargs)
	fi