Nick Coghlan <ncogh...@gmail.com> added the comment:

Huh? Demonstration please, as the -m switch absolutely does display tracebacks 
when the call fails:

$ python -m timeit -s "raise RuntimeError"
Traceback (most recent call last):
  File "/usr/lib64/python2.7/timeit.py", line 298, in main
    x = t.timeit(number)
  File "/usr/lib64/python2.7/timeit.py", line 194, in timeit
    timing = self.inner(it, self.timer)
  File "<timeit-src>", line 3, in inner
    raise RuntimeError
RuntimeError

The only tracebacks it suppresses are those for ImportError during the search 
process, which is deliberate:

$ python -m missing
/usr/bin/python: No module named missing

It even avoids suppressing the traceback when the module is found and an import 
error occurs later:

$ python -m timeit -s "import missing"
Traceback (most recent call last):
  File "/usr/lib64/python2.7/timeit.py", line 298, in main
    x = t.timeit(number)
  File "/usr/lib64/python2.7/timeit.py", line 194, in timeit
    timing = self.inner(it, self.timer)
  File "<timeit-src>", line 3, in inner
    import missing
ImportError: No module named missing

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<http://bugs.python.org/issue14439>
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