human
Solve the following python programming problem given the following code:
def auto_str(cls) : 
    def __str__(self) : 
        return ('%s(%s)' % (type (self).__name__, ', '.join ((('%s=%s' % item) for item in vars (self).items ())))) 
cls.__str__ = cls 
    return cls 

    
    

    Fix the buggy line: cls.__str__ = cls
assistant
#Here is Python program to fix the buggy line: cls.

cls.__str__ = __str__