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# `fetchPypi` function for fetching artifacts from PyPI.
{ fetchurl
, makeOverridable
}:
let
computeUrl = {format ? "setuptools", ... } @attrs: let
computeWheelUrl = {pname, version, python ? "py2.py3", abi ? "none", platform ? "any"}:
# Fetch a wheel. By default we fetch an universal wheel.
# See https://www.python.org/dev/peps/pep-0427/#file-name-convention for details regarding the optional arguments.
"https://files.pythonhosted.org/packages/${python}/${builtins.substring 0 1 pname}/${pname}/${pname}-${version}-${python}-${abi}-${platform}.whl";
computeSourceUrl = {pname, version, extension ? "tar.gz"}:
# Fetch a source tarball.
"mirror://pypi/${builtins.substring 0 1 pname}/${pname}/${pname}-${version}.${extension}";
compute = (if format == "wheel" then computeWheelUrl
else if format == "setuptools" then computeSourceUrl
else throw "Unsupported format ${format}");
in compute (builtins.removeAttrs attrs ["format"]);
in makeOverridable( {format ? "setuptools", sha256 ? "", hash ? "", ... } @attrs:
let
url = computeUrl (builtins.removeAttrs attrs ["sha256" "hash"]) ;
in fetchurl {
inherit url sha256 hash;
})
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