Poetry can't install opencv but pip can (RPI)

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate. NOTE: there are some similar mac os ones, but some of the solutions are targeted at macs and none worked for me.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Raspbian, release 10
• Poetry version: 1.16

Issue

poetry add opencv-python-headless fails, but pip install opencv-python-headless works.

This is my first time using poetry and it’s not going very well. I’ve spent a few hours searching around for solutions but no luck, the closest I’ve come is #3621 (I tried many of the solutions in the linked issues), I’ve tried installing different versions of opencv, upgrading pip, reinstalling poetry… nothing has worked so far.

[A-Telfer]

Without specifying the version it tries to install the latest pip version (4.5.2.52) and fails. The reason pip works on the RPI without specifying the version is that it seems to search piwheels first and install 4.5.1.48.

It would be nice if poetry could be configured to have the same behavior as pip

[A-Telfer]

Thanks for the suggestions, I got it working

1. Following @epower, I added piwheels to the pyproject.toml file

[[tool.poetry.source]]
name = "piwheels"
url = "https://www.piwheels.org/simple/"

1. Look on piwheels to find which opencv versions are supported, then explicitly add it. eg poetry add opencv-python-headless==4.5.1.48