Python Data Science Snippets

Wed, 08 Jul 2020 00:00:00 +0200

This article needs update!

Jupyter

Installation

pip in venv

mkdir newdir && cd newdir
python -m venv .venv (1)
source .venv/bin/activate (2)
pip install jupyter numpy pandas sqlalchemy (3)
pip freeze > requirements.txt (4)
python -m jupyter lab (5)
deactivate (6)

1	create a new virtual environment
2	activate the environment
3	install several libraries into the activated environment
4	create a list with all dependencies install for sharing or reinstallation later
5	start jupyter
6	having finished we might want to exit the virtual environment

Python Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Virtual Environments

Create and activate a venv

python -m venv /path/to/new-env (1)
source /path/to/new-env/bin/activate (2)

1	Creates a new virtual environment
2	Activate the new virtual environment

Deactivate venv

deactivate

Save used dependencies to a file

pip freeze > dependencies.txt

Install dependencies from file

pip install -r dependencies.txt

Storing and fetching Credentials from the System Keyring

I am using jaraco/keyring here:

pip install keyring

import keyring

keyring.set_password("system", "db.sample.password", "xoxo")

print(keyring.get_password("system", "db.sample.password"))