def iter_params_for_processing(invocation_order, declaration_order):
 def sort_key(item):
  try:
   idx = invocation_order.index(item)
  except ValueError:
   idx = float('inf')
  return ((not item.is_eager), idx)
 return sorted(declaration_order, key=sort_key)

def iter_params_for_processing ( invocation_order , declaration_order ) : def sort_key ( item ) : try : idx = invocation_order . index ( item ) except ValueError : idx = float ( 'inf' ) return ( ( not item . is_eager ) , idx ) return sorted ( declaration_order , key = sort_key )
given a sequence of parameters in the order as should be considered for processing and an iterable of parameters that exist .