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http://blog.donews.com/maverick/archive/2006/07/09/951101.aspx
ѧϰ±Ê¼Ç£ºPythonµÄÅÅÐò
PythonÓïÑÔÄÚÖÃÁËsort·½·¨£¬¿ÉÒԺܷ½±ãµØ¶Ôij¸öList½øÐÐÅÅÐò£º
L = [6, 5, 1, 3, 4, 2]
L.sort()
print L
---------- Run Python Program ----------
[1, 2, 3, 4, 5, 6]
ijЩʱºò£¬ÎÒÃÇÏ£Íû°´ÕÕ×Ô¼º¶¨ÒåµÄÅÅÐò¹æÔòÀ´ÅÅÐò£¨ÀýÈ磬°´¹Ø¼ü´ÊµÄȨÖØÅÅÐò£¬°´È˵ÄÄêÁäÅÅÐò£¬µÈµÈ£©¡£ÔÚJavaÓïÑÔÖУ¬ÎÒÃÇ¿ÉÒÔ×Ô¶¨ÒåComparatorÀ´ÊµÏÖ£¬PythonÖÐÒ²ÌṩÁËÀàËƵİ취¡£
ÈôListÖÐÿ¸öÔªËض¼ÊÇ2-tuple£¬tupleÖеÚÒ»¸öÔªËØΪStringÀàÐ͵Äkeyword£¬µÚ¶þ¸öÔªËØΪ¸Ã×Ö·û´®¶ÔÓ¦µÄȨÖØ£¨intÀàÐÍ£©£¬Ï£Íû°´ÕÕȨÖØÅÅÐò£¨´Ó¸ßµ½µÍ£©£¬Ôò¿ÉÒÔÕâÑù£º
def my_cmp(E1, E2):
    return -cmp(E1[1], E2[1])    #compare weight of each 2-tuple
                    #return the negative result of built-in cmp function
                    #thus we get the descend order
L = [('a', 0), ('b', 1), ('c', 2), ('d', 3)]
L.sort(my_cmp)
print L
---------- Run Python Program ----------
[('d', 3), ('c', 2), ('b', 1), ('a', 0)]
ÕýÒòΪ¿ÉÒÔ×Ô¶¨Òåcmp·½·¨£¬ÎÒÃDz»·Á̽¾¿Ò»Ï£¬built-inµÄsort·½·¨£¬µ½µ×ÊDzÉÓõÄÄÄÒ»ÖÖÅÅÐòËã·¨£º
from random import shuffle
def my_cmp(E1, E2):
    print 'E1:', E1, 'E2:', E2
    return cmp(E1, E2)
L = range(0, 10)
shuffle(L)
print L
L.sort(my_cmp)
---------- Run Python Program ----------
[5, 3, 7, 6, 2, 8, 9, 4, 1, 0]
E1: 3 E2: 5
E1: 7 E2: 3
E1: 7 E2: 5
E1: 6 E2: 5
E1: 6 E2: 7
E1: 2 E2: 6
E1: 2 E2: 5
E1: 2 E2: 3
E1: 8 E2: 5
E1: 8 E2: 7
E1: 9 E2: 6
E1: 9 E2: 8
E1: 4 E2: 6
E1: 4 E2: 3
E1: 4 E2: 5
E1: 1 E2: 6
E1: 1 E2: 4
E1: 1 E


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