python对列表排序

#Sorting basic:
>>> print sorted([5, 2, 3, 1, 4])
[1, 2, 3, 4, 5]
>>> L = [5, 2, 3, 1, 4]
>>> L.sort()
>>> print L
[1, 2, 3, 4, 5]

#Sorting  cmp:
>>>L = [('b',2),('a',1),('c',3),('d',4)]
>>>print sorted(L, cmp=lambda x,y:cmp(x[1],y[1]))
[('a', 1), ('b', 2), ('c', 3), ('d', 4)]

#Sorting  keys:
>>>L = [('b',2),('a',1),('c',3),('d',4)]
>>>print sorted(L, key=lambda x:x[1]))
[('a', 1), ('b', 2), ('c', 3), ('d', 4)]

#Sorting  reverse:
>>> print sorted([5, 2, 3, 1, 4], reverse=True)
[5, 4, 3, 2, 1]
>>> print sorted([5, 2, 3, 1, 4], reverse=False)
[1, 2, 3, 4, 5]
#注：效率key>cmp(key比cmp快)