It evolved out of pyxterm, which was part of GraphTerm (as lineterm.py), v0.57.0 (2014-07-18), and ultimately derived from the public-domain Ajaxterm code, v0.11 (2008-11-13) (also on Github as part of QWeb).
Equivalent System Packages¶
$ conda install terminado
macports: install the following packages: py-terminado
$ sudo xbps-install python3-terminado
However, these system packages will not be used for building Sage because using Python site-packages is not supported by the Sage distribution; see trac ticket #29023