code: def scale_stoichiometry( self, scaling ):
           
          return { k:v*scaling for k,v in self.stoichiometry.items() }
docs: Scale the Calculation stoichiometry
          Returns the stoichiometry, scaled by the argument scaling.
  
          Args:
              scaling (float): The scaling factor.
  
          Returns:
              (Counter(Str:Int)): The scaled stoichiometry as a Counter of label: stoichiometry pairs