code: def has_quantity(self, quantity, include_native=True):
          
  
          if include_native:
              return all(q in self._native_quantities for q in self._translate_quantities({quantity}))
  
          return quantity in self._quantity_modifiers
docs: Check if *quantity* is available in this catalog
  
          Parameters
          ----------
          quantity : str
              a quantity name to check
  
          include_native : bool, optional
              whether or not to include native quantity names when checking
  
          Returns
          -------
          has_quantity : bool
              True if the quantities are all available; otherwise False