Automating post-install of Python dependency from Git using Poetry

I'm using Poetry for Python dependency management, along with PyCrate for ASN.1 encoding/decoding.

PyCrate is a dependency pulled from GitHub, and once pulled from GitHub, is installed by running a setup file within the PyCrate directory.

python install

I would like to integrate the installation step into my pyproject.toml, if possible. My current pyproject.toml includes PyCrate as follows:

pycrate = {git = ""}

This will pull PyCrate from the GitHub repository, but into the src folder in the virtualenv created by Poetry.

Is there any way to automatically run the setup script when performing a poetry install? I have looked into using Poetry scripts, but haven't been able to get this up and running correctly as of yet.

My current setup involves running a poetry install, then manually running the install for PyCrate, however I would like to have my poetry install to perform the full setup, if it can be done.

Any help with this would be much appreciated.

Asked by: Adelaide418 | Posted: 06-12-2021

Answer 1

Poetry should already run python install for you when you run poetry install.

Poetry basically just runs pip install package, which downloads the package, and essentially just runs python install on the package!

Under the hood, [pip] will run python install


However, poetry only installs the package inside an isolated virtual environment, to avoid polluting the rest of your computer.

To run something with poetry, you need to run it with poetry run YOUR_COMMAND

In order to run a script inside the virtual environment, you must run poetry shell to enter the virtual environment, or poetry run YOUR_COMMAND. E.g. to run a Python script, you should do poetry run python


If you have a folder with the following pyproject.toml file:

name = "test"
version = "0.1.0"
description = ""
authors = ["Your Name <>"]

python = "^3.6"
pycrate = {git = ""}


requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

After running poetry install, you can access all the pyrcrate scripts by running poetry run SCRIPT_NAME:

# works because was installed with poetry install
me@computer:~/example-project$ poetry run poetry run
usage: [-h] [-bl BL] [-wt] input error: the following arguments are required: input

If you have a Python file that imports a pycrate library, it also needs to be run using poetry run:

me@computer:~/example-project$ cat 
import pycrate_core
me@computer:~/example-project$ poetry run python

Answered by: Alberta237 | Posted: 07-01-2022

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