parameters: (self, key)
docstring: Remove a rule from filter list
          If the key isn't in the list, do nothing
docstring_summary: Remove a rule from filter list
          If the key isn't in the list, do nothing
docstring_tokens: Remove a rule from filter list If the key isn t in the list do nothing
function: def del_filter(self, key):
          """
          Remove a rule from filter list
          If the key isn't in the list, do nothing
          """
          if key in self._filter:
              del self._filter[key]
function_tokens: def del_filter ( self , key ) : if key in self . _filter : del self . _filter [ key ]