human
Solve the following python programming problem given the following code:
def _add_public_adder(self) : 
    '
        Add a public ``add_x()`` method to the parent element class.
        ' 
    def add_child(obj) : 
        private_add_method = getattr (obj, self._add_method_name) 
        child = private_add_method () 
        return child 
add_child.__doc__ = ('Add a new ``<%s>`` child element unconditionally, inserted in the correct sequence.' % add_child._nsptagname) 
    self._add_to_class (self._public_add_method_name, add_child) 

    
    

    Fix the buggy line: add_child.__doc__ = ('Add a new ``<%s>`` child element unconditionally, inserted in the correct sequence.' % add_child._nsptagname)
assistant
#Here is Python code to fix the buggy line: add_child.

add_child.__doc__ = ('Add a new ``<%s>`` child element unconditionally, inserted in the correct sequence.' % self._nsptagname)