Terry J. Reedy added the comment:
test_idle, which runs the tests in idlelib/idle_test, currently comprises 9
test methods and perhaps 100 lines that do not, as far as I know, use warnings
or logging. However, perhaps this has an effect:
F:\Python\dev\cpython\PCbuild>python_d -m test test_idle
[1/1] test_idle
Warning -- os.environ was modified by test_idle
Warning -- locale was modified by test_idle
1 test altered the execution environment:
test_idle
Of course, the idle test code itself does no such modification. So I have no
idea what the warning is about or how to stop it.
F:\Python\dev\cpython\PCbuild>python_d -m test.test_idle
which runs under unittest, does not produce the warning.
The other test files that use tcl/tk/tkinter, test_tcl, test_tk,
test_ttk_guionly, and test_ttk_textonly, produce the os.environ warning but not
the locale warning.
I duplicated the failure with the command you gave. Substituting _tcl or _tk
for _idle removes the error. So perhaps the locale alteration, however it
happens, is the problem.
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<http://bugs.python.org/issue18081>
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