--- /dev/null
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+DISTUTILS_USE_SETUPTOOLS=rdepend
+PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_REQ_USE="sqlite,tk?,xml(+)"
+
+inherit distutils-r1
+
+DESCRIPTION="Natural Language Toolkit"
+HOMEPAGE="https://www.nltk.org/ https://github.com/nltk/nltk/"
+SRC_URI="https://github.com/nltk/nltk/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~x86-solaris"
+IUSE="tk"
+
+RDEPEND="dev-python/six[${PYTHON_USEDEP}]"
+BDEPEND="
+ test? (
+ dev-python/joblib[${PYTHON_USEDEP}]
+ >=dev-python/nltk-data-20200312-r1
+ dev-python/numpy[${PYTHON_USEDEP}]
+ dev-python/pyparsing[${PYTHON_USEDEP}]
+ dev-python/twython[${PYTHON_USEDEP}]
+ sci-libs/scikits_learn[${PYTHON_USEDEP}]
+ sci-libs/scipy[${PYTHON_USEDEP}]
+ )"
+PDEPEND="dev-python/nltk-data"
+
+distutils_enable_tests nose
+
+src_prepare() {
+ # requires unpackaged pycrfsuite
+ sed -i -e '/>>>/s@$@ # doctest: +SKIP@' nltk/tag/crf.py || die
+ # replace fetching from network with duplicate file URL
+ sed -e 's@https://raw.githubusercontent.com/nltk/nltk/develop/nltk/test/toy.cfg@nltk:grammars/sample_grammars/toy.cfg@' \
+ -i nltk/test/data.doctest || die
+ # requires X and hangs in Xvfb
+ sed -e 's:test_plot:_&:' \
+ -i nltk/test/unit/test_cfd_mutation.py || die
+
+ distutils-r1_src_prepare
+}
+
+src_test() {
+ cd nltk/test || die
+ distutils-r1_src_test
+}
+
+python_test() {
+ "${EPYTHON}" runtests.py -v || die "Tests failed with ${EPYTHON}"
+}