setuptools
Zope

[:python_version <= "3.5"]
werkzeug<2

[:python_version == "2.7"]
ipaddress

[:python_version == "3.6"]
werkzeug<2.1

[:python_version > "3.6"]
werkzeug

[docs]
sphinx_rtd_theme

[docs:python_version < "3"]
Sphinx<2

[docs:python_version >= "3"]
Sphinx
