列表的排序

修改原列表，不建新列表的排序

>>> a
[10, 20, 30, 40, 50, 20, 30, 20, 30]
>>> id(a)
52279816

>>> a.sort()  # 默认是升序排列
>>> a
[10, 20, 20, 20, 30, 30, 30, 40, 50]
>>> id(a)
52279816

>>> a = [10, 20, 30, 40, 50, 20, 30, 20, 30]
>>> id(a)
63441496
>>> a.sort(reverse=True)  #降序排列
>>> a
[50, 40, 30, 30, 30, 20, 20, 20, 10]
>>> id(a)
63441496

>>> a = [10, 20, 30, 40, 50, 20, 30, 20, 30]
>>> import random
>>> random.shuffle(a)  # 打乱顺序
>>> a
[20, 30, 40, 50, 30, 20, 20, 30, 10]
>>> random.shuffle(a)
>>> a
[20, 30, 10, 40, 30, 20, 20, 50, 30]
>>> random.shuffle(a)
>>> a
[40, 10, 50, 20, 30, 30, 20, 30, 20]

建新列表的排序

也可以通过内置函数sorted()进行排序，这个方法返回新列表，不对原列表做修改。

后续补充

列表相关的其他内置函数汇总

max和min

用于返回列表中最大和最小值

>>> a
[40, 10, 50, 20, 30, 30, 20, 30, 20]

>>> max(a)
50
>>> min(a)
10

sum

对数值型列表的所有元素进行求和操作，对非数值型列表运算则会报错。

>>> a
[40, 10, 50, 20, 30, 30, 20, 30, 20]
>>> sum(a)
250

>>> b = [2,5,6,7,'king']
>>> sum(b)
Traceback (most recent call last):
  File "<pyshell#125>", line 1, in <module>
    sum(b)
TypeError: unsupported operand type(s) for +: 'int' and 'str'