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pywho

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

Why pywho?

  • "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 3.9+.

Quick start

pip install pywho
pywho

Features

  • 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 .)