Python——sorted

1.对字典进行排序：

d = {0: [2, 3], 1: [5, 4], 2: [9, 6], 3: [4, 7], 4: [8, 1], 5: [7, 2]}

1.1按键排序

print sorted(d.items(), lambda x, y: cmp(x[1][0], y[1][0]))

结果：

[(0, [2, 3]), (3, [4, 7]), (1, [5, 4]), (5, [7, 2]), (4, [8, 1]), (2, [9, 6])]

---

1.2按值元素排序（此处的值是一个list的第1个元素）

print sorted(d.items(), lambda x, y: cmp(x[1][1], y[1][1]))

结果：

[(4, [8, 1]), (5, [7, 2]), (0, [2, 3]), (1, [5, 4]), (2, [9, 6]), (3, [4, 7])]

注意：此处排序后生成的是tuple而不是dict对象。

---

1.3将列表转换为字典

dd = sorted(d.items(), lambda x, y: cmp(x[1][0], y[1][0]))print dict(zip([x[0] for x in dd],[x[1] for x in dd]))

结果

{0: [2, 3], 1: [5, 4], 2: [9, 6], 3: [4, 7], 4: [8, 1], 5: [7, 2]}