One command to explain your Python environment.
Ever asked "Which Python am I running? Why is it using that venv? Where are my packages?" — pywho answers all of it instantly.
$ pywho pywho - Python Environment Inspector
==============================================
Interpreter
Executable: /Users/dev/.venv/bin/python3
Version: 3.12.3 (CPython)
Compiler: Clang 15.0.0
Architecture: 64-bit
Virtual Environment
Active: Yes
Type: uv
Path: /Users/dev/myproject/.venv
Package Manager
Detected: uv
- "Works on my machine" is the #1 debugging friction in Python. pywho kills it with one command.
- Paste the output into a GitHub issue, Slack message, or Stack Overflow question.
- Zero dependencies. Pure stdlib. Works everywhere Python runs.
- Cross-platform. Linux, macOS, Windows. Python 3.10+.
pip install pywho
pywho- Interpreter details (version, compiler, architecture)
- Virtual environment detection (venv, virtualenv, uv, conda, poetry, pipenv)
- Package manager identification
- Full sys.path listing
- Site-packages locations
- JSON output for CI/scripting
- Installed package listing
- Import tracing (
pywho trace <module>) - Project-wide shadow scanning (
pywho scan .)