对象里没这个东西。。。

  

    

      
class s:
      ...     a=1
      ...     b=2
      ...     print a
      ...     print b
      ...
      1
      2
      ss= s
      ss
      
      ss.a
      1
      ss.c
      Traceback (most recent call last):
        File "", line 1, in 
      AttributeError: class s has no attribute 'c'