Qt5 for python3.9?

[Henry S. Thompson]

The existing python3-pyqt5 package installs into the python3.6 tree,
and doesn't work with python3.9.

Trying to install PyQt5 with pip3 also fails.

Has anyone got a working version of Qt+Python3.9 ?

Alternatively, has anyone got a working graphical backend for
matplotlib + python3.9?

My Cygwin, python3.9 and pip are all up-to-date as of today.

Thanks,

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                       URL: http://www.ltg.ed.ac.uk/~ht/
 [mail from me _always_ has a .sig like this -- mail without it is forged spam]

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.