![]() ![]() Suppose you want to sort the following list of dictionaries with primary key 'name' ascending, and secondary key 'surname' descending. In addition, the dictionary retains the order in which items were inserted from version 3.6 and allowed constant time for data retrieval. ![]() the keys support comparison but not negation. A common pattern is to sort complex objects using some of the object’s indices as keys. Sort Dictionary by key in Python ApPython dictionary is a useful data structure for maintaining a record of key and value pairs. We can call this method on our addressbook as below: addresskeys addressbook. ![]() In this, firstly we sort the dictionary by keys for desired order using sorted (), then keys and values are extracted by items () functions that are returned as pair by lambda function. The keys () method of a dictionary returns a list-like object containing all the keys of the dictionary. To supplement rather than repeat what is stated in the other answers, this question raises an interesting point (although not directly needed in the case in the question) about what happens if you want to sort on two keys, with the primary ascending and the secondary descending, but where neither key is numeric so you cannot employ the trick of negating one of the keys - i.e. Method 1 : Using sum () + sorted () + items () + lambda The combination of above functions can be used to perform this particular task. Rather than creating new dicts, which is really the only way to change the key order, you should fix where the dictionaries are created to either use collections.OrderedDict or if you are using 3.6 or later, just put the dictionaries in the right order to begin with. ![]()
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