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Python dictionary (dict) sorted by key and value
- 高洛峰Original
- 2017-03-01 14:21:091485browse
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Python The characteristic of dictionary (dict) is that it is unordered. The corresponding value (value) is extracted according to the key (key). If we need the dictionary to be sorted by value, then we can Use the following method to proceed:
1 The following is sorted in order of value from large to small.
dic = {'a':31, 'bc':5, 'c':3, 'asd':4, 'aa':74, 'd':0}
dict= sorted(dic.items(), key=lambda d:d[1], reverse = True)
print(dict)
Output result:
[('aa', 74), ('a', 31), ('bc', 5), ('asd', 4), ('c', 3), ('d', 0)]
Let’s break down the code below:
print dic.items() gets a list of [(key, value)].
Then use the sorted method, passing the key parameter, to specify that the sorting is based on value, that is, the value of the first element d[1. reverse = True means that it needs to be flipped. The default is from small to large. If it is flipped, it will be from large to small.
2 Sort the dictionary by key:
dic = {'a':31, 'bc':5, 'c':3, 'asd':4, 'aa':74, 'd':0}
dict= sorted(dic.items(), key=lambda d:d[0])
print dict
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