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File "doctest_problem.py", line 4, in __main__
Failed example:
    f() # doctest: +ELLIPSIS
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python2.5/doctest.py", line 1228, in __run
        compileflags, 1) in test.globs
      File "<doctest __main__[0]>", line 1, in <module>
        f() # doctest: +ELLIPSIS
    UnicodeEncodeError: 'ascii' codec can't encode character u'\u0105' in position 4: ordinal not in range(128)
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1 items had failures:
   1 of   1 in __main__
***Test Failed*** 1 failures.