call site 6 for code.Source.__getitem__
code/testing/test_frame.py - line 10
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   def test_frame_getsourcelineno_myself():
       def func():
           return sys._getframe(0)
       f = func()
       f = py.code.Frame(f)
       source, lineno = f.code.fullsource, f.lineno
->     assert source[lineno].startswith("        return sys._getframe(0)")