What is mustel?

A simple CLI tool that helps you understand and control your Python setup. Perfect for beginners and experts alike.

🔍 Inspect

See all Python versions on your system. Find where packages are installed. Fix ModuleNotFoundError.

📦 Venv Manager

Create, list, and delete virtual environments. Detect and fix broken venvs automatically.

🧭 Understand

Visual dashboards show exactly what's happening. No more guessing or memorizing commands.

😕 The Problem mustel Solves

You install a package:

pip install numpy

But Python says:

ModuleNotFoundError: No module named 'numpy'

Why? You have multiple Pythons. pip installed in one, you're running another.

mustel shows you exactly which packages are in which Python — and helps you manage virtual environments so this never happens again.

See it in action

🔍 Inspect your Python setup

Windows PowerShell

PS C:\> mustel all 🦦 mustel — all pythons Found 2 Python(s): ------------------------------------------------------------ ★ Python 3.13.7 (current) Path: C:\Users\You\AppData\Local\Programs\Python\Python313\python.exe Packages: 170 Python 3.12.0 Path: C:\Users\You\AppData\Local\Programs\Python\Python312\python.exe Packages: 45 ------------------------------------------------------------

Windows PowerShell

PS C:\> mustel check requests 🦦 mustel — check 'requests' ✅ 'requests' is available in current Python

📦 Manage virtual environments

PowerShell

PS C:\Projects\webapp> mustel venv

🦦 mustel venv

📍 Folder: C:\Projects\webapp

Status: ✅ ACTIVE

Path: .venv/

Python: Python 3.13.11

Packages: 24

Size: 156.2 MB

Commands:

mustel venv new Create venv here

mustel venv list Show all venvs

mustel venv destroy Remove venv

PowerShell

PS C:\Projects\new-app> mustel venv new

🦦 mustel venv new

📍 Creating .venv in: C:\Projects\new-app

🐍 Using: C:\Users\You\Python313\python.exe

⏳ Please wait...

✅ Venv created successfully!

mustel v0.1.3