Reduce the twisted dep to only the new single pkg.
Package-Manager: Portage-2.3.5, Repoman-2.3.2_p30
--- /dev/null
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+PYTHON_COMPAT=( python2_7 python3_{4,5,6})
+
+inherit distutils-r1
+
+DESCRIPTION="Asynchronous Python HTTP for Humans"
+HOMEPAGE="https://github.com/tardyp/txrequests"
+SRC_URI="mirror://pypi/${P:0:1}/${PN}/${P}.tar.gz"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE=""
+
+RDEPEND="
+ >=dev-python/requests-1.2.0[${PYTHON_USEDEP}]
+ dev-python/twisted[${PYTHON_USEDEP}]
+"
+DEPEND="${RDEPEND}
+ dev-python/setuptools[${PYTHON_USEDEP}]
+"