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主è¦å°±æ¯ä¸¤ä¸ªåæ°,key,reverse
å
说reverseï¼è¿ä¸ªå¾ç®åï¼å°±æ¯æåºæ¯å¦è¿è¡ååºæåºï¼ä¸è¬æ
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keyåæ°ï¼ä¸è¬å®æ¯ä¸ä¸ªå½æ°ï¼å®æ¥åå表ä¸æ¯ä¸ä¸ªå ç´ ï¼è¿åä¸ä¸ªå¯ç¨ç¨äºæ¯è¾çå¼ã
s=[1,2,3,4,5]
s.sort(key=lambda _: _**2%7)
print(s)
è¾åºçæ¯ï¼[1, 3, 4, 2, 5]
å¦æçä¸ælambda表达å¼ï¼å¯ä»¥çè¿ä¸æ®µçä»·çåæ³ï¼
def myfn(x):
....return (x * x) % 7
s=[1,2,3,4,5]
s.sort(key=myfn)
print(s)
è¾åºçç»ææ¯ä¸æ ·çã
key使ç¨çå½æ°å¯ä»¥æ¯èªå®ä¹å½æ°ä¹å¯ä»¥pythoå ç½®çå½æ°,æè æ¯æ个类æè å®ä¾çæ¹æ³ï¼åªè¦å®è½æ¥åä¸ä¸ªåæ°ï¼è¿åä¸ä¸ªå¯æ¯è¾çå¼å³å¯ãæ¯å¦è¿æ ·ï¼
s=[[1,2,4],[3,3,5],[1,1,1],[5,7,9]]
s.sort(key=max) # ç´æ¥ä½¿ç¨maxå½æ°ä½ä¸ºæåºä¾æ®
print(s)
[[1, 1, 1], [1, 2, 4], [3, 3, 5], [5, 7, 9]]