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sorted()属于python内置的排序函数，它用来将可迭代对象的每个元素按照升序排列(默认)并以列表的形式返回结果。
可选参数key用来用户自定义排序规则；可选参数reverse选择升序还是降序排列(默认False，表示升序)。
注意：该内置方法和列表对象的方法属性 sort() 在功能和用法上都非常相似。
>>> help(sorted)
Help on built-in function sorted in module builtins:
sorted(iterable, /, *, key=None, reverse=False)
Return a new list containing all items from the iterable in ascending order.
A custom key function can be supplied to customize the sort order, and the
reverse flag can be set to request the result in descending order.
# 示例1：
>>> nums = [4,3,1,6,9,12]
>>> sorted(nums)
[1, 3, 4, 6, 9, 12]
# 实例2：降序排列
>>> s = 'hello world'
>>> sorted(s, reverse=True)
['w', 'r', 'o', 'o', 'l', 'l', 'l', 'h', 'e', 'd', ' ']
# 实例3：指定key
>>> users = [{'name':'jack', 'age':26}, {'name':'cindy', 'age':19}]
>>> sorted(users, key=lambda x:x['age'])
[{'name': 'cindy', 'age': 19}, {'name': 'jack', 'age': 26}]
