sorted() belong to python Built in sorting function , It is used to arrange each element of an iteratable object in ascending order ( default ) And return the results as a list .
Optional parameters key Used for user-defined sorting rules ; Optional parameters reverse Choose ascending or descending order ( default False, Indicates ascending order ).
be careful ： The built-in method and the method properties of the list object sort() It is very similar in function and usage .
>>> 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.
# Examples 1：
>>> nums = [4,3,1,6,9,12]
>>> sorted(nums)
[1, 3, 4, 6, 9, 12]
# example 2： Descending order
>>> s = 'hello world'
>>> sorted(s, reverse=True)
['w', 'r', 'o', 'o', 'l', 'l', 'l', 'h', 'e', 'd', ' ']
# example 3： appoint 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}]
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