Python

python -m pip

Upgrade all outdated packages

pipupgradeall() {
	pip --version
	pip list --outdated
	outdated=$(pip list --outdated --format=json)
	if [ $(echo "$outdated" | jq '. | any(.name | contains ("pip"))') = "true" ]; then
		pip install -U pip
	fi
	echo "$outdated" |
		jq '.[].name | select(. != "pip")' |
		xargs -n1 pip install -U
}

Install from requirements

Some Python projects provide a requirements.txt file which contains all the required packages. This file has the following pattern:

FirstPackage               # Latest version
SecondPackage == 1.0.4     # Specific version
ThirdPackage >= 1.0.4      # Minimum version
FouthPackage >= 1.0, < 1.3 # Maximum version
...

pip install -r /path/to/requirements.txt

Create your virtual Python environment

python -m venv env

Instead of env, you can use any name.

Automatically loading and unloading using direnv

Create (or add to) the .envrc file in your project. Add the following to it (replace env if you chose a different name)

source env/bin/activate