call site 20 for log.default.__init__
log/testing/test_log.py - line 45
43
44
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   def test_producer_caching(self):
       p = py.log.Producer('x1')
->     x2 = p.x2
       assert x2 is p.x2
log/producer.py - line 47
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47
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   def __getattr__(self, name):
       if '_' in name: 
           raise AttributeError, name
->     producer = self.__class__(self.keywords + (name,))
       setattr(self, name, producer)
       return producer