human
Solve the following python programming problem given the following code:
def ajax_editable_boolean(attr, short_description) : 
    "
    Convenience function: Assign the return value of this method to a variable
    of your ModelAdmin class and put the variable name into list_display.

    Example::

        class MyTreeEditor(TreeEditor):
            list_display = ('__str__', 'active_toggle')

            active_toggle = ajax_editable_boolean('active', _('is active'))
    " 
    def _fn(self, item) : 
        return ajax_editable_boolean_cell (item, attr) 
_fn.allow_tags = True 
    _fn.short_description = _fn 
    _fn.editable_boolean_field = attr 
    return _fn 

    
    

    Fix the buggy line: _fn.short_description = _fn
assistant
#Here is Python program to fix the buggy line: _fn.

_fn.short_description = short_description