python列表及其排序操作

 1 print (‘\n------------3.3.1-永久性排序--------\n‘)
 2 cars = [‘bmw‘,‘audi‘,‘toyoto‘,‘subaru‘]
 3 # 列表操作的.sort()方法排序,默认为a-z顺序排列，如果按照z-a排列需要传递一个参数‘reverse=True‘
 4 cars.sort()                                # 永久性按照a-z排序
 5 print (cars)
 6 cars.sort(reverse=True)                    # reverse=相反、颠倒、倒序
 7 print (cars)
 8
 9 print (‘\n------------3.3.2-临时排序----------\n‘)
10
11 cars1 = [‘bmw‘,‘audi‘,‘toyoto‘,‘subaru‘]
12 print ("Here is the original list:")    # 先显示原始列表一次，original list=原始 列表
13 print (cars1)
14
15 print ("\nHere is the sorted list:")
16 print (sorted(cars1,reverse=True))        # True为a-z
17 print (sorted(cars1,reverse=False))        # False为z-a
18 # 在print中用sorted()函数，使列表临时按照a-z顺序排序，同时，该函数也可以加入参数（reverse=True/false）来进行控制。
19
20 print ("\nHere is the original list again:")
21 print (cars1)                            # 再次显示原始列表
22
23 print (‘\n------------3.3.3-列表倒序排序------\n‘)
24
25 cars2 = [‘bmw‘,‘audi‘,‘toyoto‘,‘subaru‘]
26 print (cars2)
27
28 cars2.reverse()
29 # 列表操作的.reverse()方法，永久性地反转列表的排列顺序，但可以随时恢复到原来的排列顺序，只需要再次调用.reverse()即可。
30 print (cars2)
31
32
33 print (‘\n------------3.3.4-确定列表长度------\n‘)
34 cars3 = [‘bmw‘,‘audi‘,‘toyoto‘,‘subaru‘,‘benz‘]
35 print (cars3)
36 lenght =len(cars3)                         # 获取列表长度，即元素的个数，从1开始计数
37 print ("The length of the list is " + str(lenght) + ‘.‘)

------------3.3.1-永久性排序--------

[‘audi‘, ‘bmw‘, ‘subaru‘, ‘toyoto‘]
[‘toyoto‘, ‘subaru‘, ‘bmw‘, ‘audi‘]

------------3.3.2-临时排序----------

Here is the original list:
[‘bmw‘, ‘audi‘, ‘toyoto‘, ‘subaru‘]

Here is the sorted list:
[‘toyoto‘, ‘subaru‘, ‘bmw‘, ‘audi‘]
[‘audi‘, ‘bmw‘, ‘subaru‘, ‘toyoto‘]

Here is the original list again:
[‘bmw‘, ‘audi‘, ‘toyoto‘, ‘subaru‘]

------------3.3.3-列表倒序排序------

[‘bmw‘, ‘audi‘, ‘toyoto‘, ‘subaru‘]
[‘subaru‘, ‘toyoto‘, ‘audi‘, ‘bmw‘]

------------3.3.4-确定列表长度------

[‘bmw‘, ‘audi‘, ‘toyoto‘, ‘subaru‘, ‘benz‘]
The length of the list is 5.

原文地址：https://www.cnblogs.com/hzez/p/10346239.html