滚动我自己的__

见 http://docs.python.org/reference/datamodel.html#object. repr

#!/usr/bin/env python
class O(object):
    def __repr__(self):
        return '<%s.%s object at 0x%x>'%(self.__module__,self.__class__.__name__,id(self))
o=O()
print(repr(o))

# <__main__.O object at 0xb7e7d0cc>

你可以这样写自己的RPR:

class Test (object):
  def __repr__(self):
    t = type(self)
    return "<Instance of %s.%s at %x>" % (t.__module__, t.__name__, id(self))