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a snake that runs. execute python files without packaging or installation

Project description

python, but with running.

ferret provides a new shebang line for your python script that will install dependencies into a fresh venv - saving you the hassle of packaging and distribution. ferret lets you focus on writing just the code you need without sacrificing libraries.


  • Install ferret on the target environment:
pip install ferret # Warning: this will work with a python3 venv, but not a virtualenv (as used by pipsi)
  • Replace your shebang line with this:
#! /usr/bin/env ferret
  • Declare your dependencies in your module’s docstring:
A helpful description about your module

- requests == 2.18.4

When you run a script with ferret, it parses the file for dependency declarations, and prepares a venv to match. The environments are kept under ~/.local/ferret/venvs (you can safely delete the entire contents of that folder).


Once you’ve installed ferret, take it for a spin:

cat > << EOF
#! /usr/bin/env ferret
Gets my IP from

- requests == 2.18.4


import requests

response = requests.get('')
chmod +x

The first time you run the script, ferret will set up a venv and install requests in it. Subsequent runs will re-use that environment.

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