python 中列表的排序、逆转

 

001、排序

a、

>>> test = [8, 2, 5, 9, 3]
>>> test
[8, 2, 5, 9, 3]
>>> test.sort()        ## 直接在原始列表中排序
>>> test
[2, 3, 5, 8, 9]

>>> test = [8, 2, 5, 9, 3]
>>> test.sort(reverse = True)    ## 逆向排序
>>> test
[9, 8, 5, 3, 2]

 

b、

>>> test = [8, 2, 5, 9, 3]
>>> test
[8, 2, 5, 9, 3]
>>> sorted(test)                   ## 不再原始列表中排序
[2, 3, 5, 8, 9]
>>> test
[8, 2, 5, 9, 3]

>>> test = [8, 2, 5, 9, 3]
>>> test
[8, 2, 5, 9, 3]
>>> sorted(test, reverse = True)    ## 逆向排序
[9, 8, 5, 3, 2]
>>> test
[8, 2, 5, 9, 3]

 

002、逆转

a、

>>> test = [8, 2, 5, 9, 3]
>>> test
[8, 2, 5, 9, 3]
>>> test.reverse()      ## 在原始列表中逆转
>>> test
[3, 9, 5, 2, 8]

 

b、

>>> test = [8, 2, 5, 9, 3]
>>> test
[8, 2, 5, 9, 3]
>>> reversed(test)                 ## reversed函数逆转
<list_reverseiterator object at 0x7f9b228a59b0>
>>> for i in reversed(test):
...     print(i)
...
3
9
5
2
8

 

c、列表切片逆转

>>> test = [8, 2, 5, 9, 3]
>>> test
[8, 2, 5, 9, 3]
>>> test[::-1]                  ## 列表切片逆转
[3, 9, 5, 2, 8]