Python webpy中AttributeError是什么类型错误，,这是什么错误，怎么解决？

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'