I introduced nonbreaking spaces in Lib/os.py in a comment, because I kept Alt Gr. key pressed to write the space after # (stupid Xorg keyboard variant!).
This change introduces a strange bug in "LANG=C ./python -m test.regrtest -v test_imp test_trace" command.
The real bug was fixed in issue #10329, but I would like to know if it would be possible to block a commit introducing nonbreaking spaces? A least for me :-)