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It seems that on Python 3 (i.e. the py3k branch) trace.py can not handle source that includes Unicode characters. Running the test suite with code coverage info via
 ./python Lib/test/regrtest.py -T -N -uurlfetch,largefile,network,decimal
sometimes fails with the following exception:
Traceback (most recent call last):
 File "Lib/test/regrtest.py", line 1500, in <module>
 main()
 File "Lib/test/regrtest.py", line 696, in main
 r.write_results(show_missing=True, summary=True, coverdir=coverdir)
 File "/home/coverage/python/Lib/trace.py", line 319, in write_results
 lnotab, count)
 File "/home/coverage/python/Lib/trace.py", line 369, in write_results_file
 outfile.write(line.expandtabs(8))
UnicodeEncodeError: 'ascii' codec can't encode character '\xe4' in
position 30: ordinal not in range(128)
The script that produces code coverage info on http://coverage.livinglogic.de/ uses this feature to generate code coverage info.
Applying the attached patch (i.e. specifying an explicit encoding when opening the output file) fixes the problem.