Ned Deily added the comment:
This is an instance of the problems identified in Issue21882, namely that
test___all__ is importing turtledemo modules and some of them have bad side
effects. In this case, it's turtledemo.clock which is calling mode() which now
unconditionally attempts to create a Tk window during the import. That means Tk
is being called without being subject to the checks of
test_support.requires('gui'). One of the reasons for having that check is to
prevent this kind of crash (as documented in Issue8716) in Tk when Tk is
invoked in a process that cannot make a window manager connection, as when
running under a buildbot with a user name that is not logged in as the main gui
user. Note also that when Tk crashes, there is nothing the Python code can
really do to recover from it. The solution is as outlined in #21882: don't
unconditionally call mode() in the import path.
----------
assignee: ronaldoussoren ->
components: -Macintosh
nosy: +ned.deily
resolution: -> duplicate
stage: -> resolved
status: open -> closed
superseder: -> turtledemo modules imported by test___all__ cause side effects
or failures
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21884>
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