使用列表對(duì)象的sort()方法進(jìn)行原地排序，支持多種不同的排序方法。

>>>aList=[3,4,5,6,7,9,11,13,15,17]

>>>importrandom

>>>random.shuffle(aList)

>>>aList

[3,4,15,11,9,17,13,6,7,5]

>>>aList.sort()#默認(rèn)是升序排序

>>>aList.sort(reverse=True)#降序排序

>>>aList

[17,15,13,11,9,7,6,5,4,3]

>>>aList.sort(key=lambdax:len(str(x)))#按轉(zhuǎn)換成字符串的長(zhǎng)度排序

>>>aList

[9,7,6,5,4,3,17,15,13,11]

使用內(nèi)置函數(shù)sorted()對(duì)列表進(jìn)行排序并返回新列表

>>>aList

[9,7,6,5,4,3,17,15,13,11]

>>>sorted(aList)#升序排序

[3,4,5,6,7,9,11,13,15,17]

>>>sorted(aList,reverse=True)#降序排序

[17,15,13,11,9,7,6,5,4,3]

使用列表對(duì)象的reverse()方法將元素原地逆序

>>>aList=[3,4,5,6,7,9,11,13,15,17]

>>>aList.reverse()

>>>aList

[17,15,13,11,9,7,6,5,4,3]

使用內(nèi)置函數(shù)reversed()對(duì)列表元素進(jìn)行逆序排列并返回迭代對(duì)象

>>>aList=[3,4,5,6,7,9,11,13,15,17]

>>>newList=reversed(aList)#返回reversed對(duì)象

>>>list(newList)#把reversed對(duì)象轉(zhuǎn)換成列表

[17,15,13,11,9,7,6,5,4,3]

>>>foriinnewList:

print(i,end='')#這里沒有輸出內(nèi)容

#迭代對(duì)象已遍歷結(jié)束

>>>newList=reversed(aList)#重新創(chuàng)建reversed對(duì)象

>>>foriinnewList:

print(i,end='')

17151311976543

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