TypeError; Must use key word argument or key function in python 3.x -


i new python, trying port script in 2.x 3.x encountering error typeerror; must use key word argument or key function in python 3.x. below piece of code: please help

def resort_working_array( self, chosen_values_arr, num ):     item in self.__working_arr[num]:         data_node = self.__pairs.get_node_info( item )          new_combs = []         in range(0, self.__n):             # numbers of new combinations created if item appended array             new_combs.append( set([pairs_storage.key(z) z in xuniquecombinations( chosen_values_arr+[item], i+1)]) - self.__pairs.get_combs()[i] )         # weighting node         item.weights =  [ -len(new_combs[-1]) ]    # node creates of new pairs best         item.weights += [ len(data_node.out) ] # less used outbound connections produce more new pairs while search continues         item.weights += [ len(x) x in reversed(new_combs[:-1])]         item.weights += [ -data_node.counter ]  # less used node better         item.weights += [ -len(data_node.in_) ] # otherwise prefer node of free inbound connections; somehow works out better ;)      self.__working_arr[num].sort( key = lambda a,b: cmp(a.weights, b.weights) )

looks problem in line.

self.__working_arr[num].sort( key = lambda a,b: cmp(a.weights, b.weights) )

the key callable should take 1 argument. try:

self.__working_arr[num].sort(key = lambda a: a.weights)

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