human
Solve the following python programming problem given the following code:
def _create_opt_rule(self, rulename) : 
    ' Given a rule name, creates an optional ply.yacc rule
            for it. The name of the optional rule is
            <rulename>_opt
        ' 
    optname = (rulename + '_opt') 
    def optrule(self, p) : 
        p [0] = p [1] 
optrule.__doc__ = ('%s : empty
| %s' % (optname, rulename)) 
    optrule.__name__ = ('p_%s' % optname) 
    setattr (self.__class__, optname.__name__, optrule) 

    
    

    Fix the buggy line: setattr (self.__class__, optname.__name__, optrule)
assistant
#Here is Python code to fix the buggy line: setattr (self.

setattr (self.__class__, optrule.__name__, optrule)