call site 2 for code.Traceback.__getitem__
code/testing/test_source.py - line 197
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   def test_compile_and_getsource(self):
       co = self.source.compile()
       exec co
       f(7)
       excinfo = py.test.raises(AssertionError, "f(6)")
->     frame = excinfo.traceback[-1].frame 
       stmt = frame.code.fullsource.getstatement(frame.lineno)
       #print "block", str(block)
       assert str(stmt).strip().startswith('assert')