PyDERASN depends on `six <https://pypi.org/project/six/>`__ package
for keeping compatibility with Py27/Py35. It is included in the tarball.
You can also find it mirrored on :ref:`download <download>` page.
+``termcolor`` is an optional dependency used for output colourizing.
+``urwid`` is an optional dependency used for :ref:`interactive browser <browser>`.
You could use pip (**no** OpenPGP authentication is performed!) with PyPI::