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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.

usage

  • 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

ferret:
- 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).

example

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

cat > just_a_script.py << EOF
#! /usr/bin/env ferret
"""
Gets my IP from icanhazip.com

ferret:
- requests == 2.18.4

"""

import requests

response = requests.get('http://icanhazip.com')
response.raise_for_status()
print(response.text())
EOF
chmod +x just_a_script.py
./just_a_script.py

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.

Project details


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Filename, size & hash SHA256 hash help File type Python version Upload date
ferret-0.8.0-py3-none-any.whl (7.0 kB) Copy SHA256 hash SHA256 Wheel py2.py3 Sep 15, 2018
ferret-0.8.0.tar.gz (3.8 kB) Copy SHA256 hash SHA256 Source None Sep 15, 2018

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