Nix openai python dev-environment build failure - python-3.x

Question

I am trying to make a python37 development environment containing the openai pypi package using nix.
This question was originally on reddit, but I couldn't find an answer and the activity in the thread was very low.
using the tipps i got there and the language frameworks documentation i managed to come up with the following expressions:
default.nix:
with import<nixpkgs>{};
( let
openai = pkgs.callPackage ./release.nix {
inherit pkgs;
buildPythonPackage = pkgs.python37Packages.buildPythonPackage;
};
in pkgs.python37.buildEnv.override rec {
extraLibs = [ pkgs.python37Packages.requests openai ];
}
).env
release.nix
{ pkgs, buildPythonPackage }:
buildPythonPackage rec{
pname="openai";
version="0.2.6";
src=fetchTarball{
url="https://files.pythonhosted.org/packages/59/2d/b3bc2aa663b2c376f073fd141e128ecfb47f3aff95ccee284a74d85a1ef8/openai-0.2.6.tar.gz";
sha256="0cplrzfw3i6yxcd35ijfjkx9jbcvkvzn5jn5b8s657a8myhm6kav";
};
propagateBuildInputs = [ pkgs.python37Packages.requests ];
doCheck=false;
meta = { # only for testing the env right now
homepage="...";
description="...";
license = "...";
maintainers= [];
};
}
however, this leaves me with the (i guess its pip-)error
Processing ./openai-0.2.6-py3-none-any.whl
ERROR: Could not find a version that satisfies the requirement requests>=2.20; python_version >= "3.0" (from openai==0.2.6) (from versions: none)
ERROR: No matching distribution found for requests>=2.20; python_version >= "3.0" (from openai==0.2.6)
builder for '/nix/store/ncnga4fcxl15xyvv3f325f9g0q45mqvr-python3.7-openai-0.2.6.drv' failed with exit code 1
which surprises me, because propagateBuildInputs = [ pkgs.python37Packages.requests ]; clearly states that the package requests (version 2.22.0 in nixpkgs) should be present at build time.
what am I misunderstanding about the buildPythonPackage function that prevents this from working?

Answer 1

Changing progagatedBuildInputs to another name like progagateBuildInputs causes it to be ignored, so any dependencies it contains (i.e. requests) are not found. For example:
yubico-client/default.nix
propagateBuildInputs = [ requests ];
ERROR: Could not find a version that satisfies the requirement requests<3.0,>=2.7 (from yubico-client==1.13.0) (from versions: none)
ERROR: No matching distribution found for requests<3.0,>=2.7 (from yubico-client==1.13.0)
propagatedBuildInputs = [ requests ];
$ nix-build -I nixpkgs=~/git/nixpkgs '<nixpkgs>' -k -A python37Packages.yubico-client
/nix/store/0yjz8smgmjr0006nmka6wliy01z8av7m-python3.7-yubico-client-1.13.0