[issue40723] IDLE: make autocomplete test run without __main__.__file__

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Go ahead. Since the failure was user visible, there should be a note.  For IDLE issues, idlelib/NEWS.txt also needs an addition, but not until ready to merge.  So add a trial blurb or not as you wish.  In any case, I need to fix the 3.8 version and perhaps the 3.7 version before another IDLE commit.

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<https://bugs.python.org/issue40723>
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