Jon Snoo added the comment:
I tested the code posted by Victor with Python 3.5 (which uses Tcl/Tk 8.6.4)
and I still get an empty clipboard when the script exits.
I also downloaded ActiveState's Tcl binary which is also version 8.6.4, and
tested the minimal reproducer posted by Serhiy
Jon Snoo added the comment:
The link to the "quick recommendations section" in the Python 2.7 and 3.3 docs
is broken. It appears that the PPUG has changed the path from
https://python-packaging-user-guide.readthedocs.org/en/latest/current.html
to
https://python-pack