Zachary Ware added the comment:
For the original issue, I agree with Eryk that about the best we can do is to
document that Tcl sets HOME as "%HOMEDRIVE%%HOMEPATH%" or "c:\" if both of
those are not set. I wonder about removing (or de-preferring) HOME in
os.path.expanduser, but that would be a significantly backward incompatible
change. Since HOME is not set by default on Windows, setting it is the easiest
way to manipulate os.path.expanduser, and changing it is going to break things.
The TCL_LIBRARY issue is completely separate. I rewrote the logic that used to
be in tkinter._fix for 3.5, it's now a part of _tkinter initialization and
TCL_LIBRARY is no longer set (permanently) by tkinter (TK_LIBRARY is not set or
inspected at all anymore, except by Tk itself). I did this in an effort to
avoid the environment warnings in the tkinter/IDLE tests, but apparently missed
the HOME issue at that point.
Anyhow, we could theoretically unset TCL_LIBRARY (and TK_LIBRARY) in that
initialization code, possibly conditional on whether TCL_VERSION can be found
in the content of TCL_LIBRARY (the assumption being that a library for the same
major version of Tcl ought to work anyway). However, without that conditional,
that would be another big backward compatibility issue; setting
{TCL,TK}_LIBRARY is a legitimate way to point tkinter towards a non-standard
Tcl/Tk library location (e.g. in an embedding situation). With conditional
clearing of {TCL,TK}_LIBRARY, we're still at the mercy of a just plain bad
setting that just happens to contain the magic string that makes it look
acceptable.
I'm -1 on making such a change anyway. We've avoided permanently setting
TCL_LIBRARY for many many years, other applications can figure out how to avoid
it as well. We can't try to clean up messes made by other badly behaved
programs, that way lies madness.
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<http://bugs.python.org/issue27263>
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