列表排序

修改原列表，不建立新列表的排序

sort()，sort(reverse=True)，random.shuffle()

 1 >>> a = [10,90,20,70,60,40,30,80]
 2 >>> a
 3 [10, 90, 20, 70, 60, 40, 30, 80]
 4 >>> a.sort()
 5 >>> a
 6 [10, 20, 30, 40, 60, 70, 80, 90]
 7 >>> a.sort(reverse=True)
 8 >>> a
 9 [90, 80, 70, 60, 40, 30, 20, 10]
10 >>> import range
11 Traceback (most recent call last):
12   File "<pyshell#6>", line 1, in <module>
13     import range
14 ModuleNotFoundError: No module named 'range'
15 >>> import random
16 >>> random.shuffle(a)
17 >>> a
18 [30, 80, 20, 40, 60, 70, 10, 90]
19 >>> random.shuffle(a)
20 >>> a
21 [30, 60, 40, 80, 20, 70, 10, 90]

建立新列表的排序

sorted()

 1 >>> a = [10,90,20,70,60,40,30,80]
 2 >>> a
 3 [10, 90, 20, 70, 60, 40, 30, 80]
 4 >>> id(a)
 5 61080232
 6 >>> a = sorted(a)
 7 >>> a
 8 [10, 20, 30, 40, 60, 70, 80, 90]
 9 >>> id(a)
10 63216936

reverse()返回迭代器

内置函数reverse()也支持进行逆序排列，与列表对象reserve()方法不同的是，内置函数reserved()不对原列表做任何修改，只是返回一个逆序排列的迭代器对象，只使用一次

 1 >>> a = [20,90,50,70]
 2 >>> a
 3 [20, 90, 50, 70]
 4 >>> c = reserve(a)
 5 Traceback (most recent call last):
 6   File "<pyshell#21>", line 1, in <module>
 7     c = reserve(a)
 8 NameError: name 'reserve' is not defined
 9 >>> c = reversed(a)
10 >>> c
11 <list_reverseiterator object at 0x04256898>
12 >>> list(c)
13 [70, 50, 90, 20]
14 >>> list(c)
15 []

列表相关的其他内置函数汇总

sum，max和min

用于返回列表中的最大值和最小值和总和

1 >>> a = [40,30,70,10]
2 >>> a
3 [40, 30, 70, 10]
4 >>> max(a)
5 70
6 >>> min(a)
7 10
8 >>> sum(a)
9 150