nixpkgs/pkgs/development/python-modules/nltk/default.nix

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{ fetchPypi, buildPythonPackage, lib, six, singledispatch, isPy3k }:
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buildPythonPackage rec {
version = "3.4.5";
pname = "nltk";
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src = fetchPypi {
inherit pname version;
extension = "zip";
sha256 = "153x2clrnigs74jdgnn3qmljdjj4gprmvpdvh49i18ls4m8mbm5y";
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};
propagatedBuildInputs = [ six ] ++ lib.optional (!isPy3k) singledispatch;
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# Tests require some data, the downloading of which is impure. It would
# probably make sense to make the data another derivation, but then feeding
# that into the tests (given that we need nltk itself to download the data,
# unless there's an easy way to download it without nltk's downloader) might
# be complicated. For now let's just disable the tests and hope for the
# best.
doCheck = false;
meta = {
description = "Natural Language Processing ToolKit";
homepage = http://nltk.org/;
license = lib.licenses.asl20;
maintainers = with lib.maintainers; [ lheckemann ];
};
}