How to sort a dictionary by its value (key)

sorted function

First introduce the sorted function, sorted (iterable, key, reverse), sorted has three parameters: iterable, key, reverse.

Iterable represents an object that can be iterated, such as dict.items(), dict.keys(), etc. key is a function used to select the elements participating in the comparison, and reverse is used to specify the sorting Is it in reverse order or order? reverse=true means reverse order (from large to small), reverse=false means order (from small to large), and the default is reverse=false.

Sort by key

To sort the dictionary by key, you can call the sorted function directly.

my_dict = {'lilee':25, 'age':24, 'phone':12}
sorted(my_dict.keys())

The output result is

['age', 'lilee', 'phone']

Use sorted(my_dict.keys()) directly to press the key value To sort the dictionary, here the key values ​​are sorted in order. If you want to sort in reverse order, you only need to set reverse to true.

sorted(my_dcit.keys(), reverse = true)

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