Python Env & Virtualenvs Cheat Sheet

Isolate dependencies

Last Updated: November 21, 2025

Focus Areas

Focus
Create isolated environments
Activate before installs

Commands & Queries

python -m venv .venv
Create env
source .venv/bin/activate
Activate
pip install -r requirements.txt
Install deps

Summary

Virtualenvs keep dependencies scoped per project.

💡 Pro Tip: Pin dependency versions in `requirements.txt` and lock files.
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