Variations of the sorted() function are the most popular and reliable to sort a dictionary by values. How to Sort a List of Dictionaries in Python: Sort and Sorted Written by Jeremy Grifski in Code Last Updated You may recall that I recently published an article on parsing a spreadsheet, and the output ended up being a list of dictionaries. Lastly, we adapted our solution to work on Python versions lower than 3.7. Instead, you can use the items() method of the dictionary to return a list of key-value pairs, and then apply enumerate() to the list of key/value pairs. We know that dictionaries are unordered, there is no index to enumerate over. We've also seen the itemgetter() function from the operator module can make our solution more succinct. Iterate over all key-value pairs of dictionary by index. We then improved our sorting by using the sorted() function. We first sorted a dictionary using two for loops. This tutorial showed how a dictionary can be sorted based on its values. From there, we can create a new, sorted dictionary: dict1 = Conclusion This function takes in the list of dictionaries. The sorted(dict1, key=dict1.get) expression will return the list of keys whose values are sorted in order. To sort a list of dictionaries by a value of the dictionary in Python, you can use the sorted() function. The get() method on dictionary objects returns the value of a dictionary's key. In this article, I have explained how to sort a list of dictionaries by value in ascending/descending order using Pyhton sorted(), sort(), lambda function, and itemgetter() functions with examples.Here, key is a function that's called on each element before the values are compared for sorting. Dictionary elements should be enclosed with ] Python program to sort a list of dictionaries using Lambda expression Algorithm Step 1: Declare a list of employees. Each element in the dictionary is in the form of key:value pairs. # Example 8: Sort a list of dictionaries having the same value for multiple keysĪ Python dictionary is a collection that is unordered, mutable, and does not allow duplicates. Print(sorted(dict_list, key=emgetter('calories'))) # Example 7: Sort list of dictionaries without key existence to sort the list of dictionaries by key age, name (like in SQL statement ORDER BY age, name), you can use: newlist sorted( listtobesorted, keylambda k: (kage, kname) ) or, likewise. Print(sorted(dict_list, key=emgetter('fruit_name'))) We still need to sort the keys and not the values - having a sorted list of values is unhelpful, because retrieving dictionary entries can only be done. We can sort the dictionary in python using keys with the help of the keys() method and for a loop. Below are 3 methods to sort the dictionary using keys. # Example 6: Set emgetter() as key and sort Apart from sorting the dictionary using values, we can also sort the dictionary using the keys component. Print(sorted(dict_list, key=lambda x: x.get('calories', 95))) If we want to order or sort the dictionary objects by their keys, the simplest way to do so is by Python's built-in sorted method, which will take any iterable and return a list of the values which has been sorted (in ascending order by default). # Example 5: Sort list of dictionaries using sorted() & get() By using the sorted() function and a key function, we can easily sort the list in ascending or descending order based on any key of the dictionaries. What you now deal with is a key-value pair, which is sometimes a more appropriate data structure for many problems instead of a simple list. Print(sorted(dict_list, key=lambda x: x.get('calories'))) # Example 4: Sort list of dictionaries using sorted() & get() To sort a list of dictionaries by a value of the dictionary, you can use the sorted() function and specify the key parameter to be a lambda function that. # Example 3: Sort list of dictionaries when key doesn't exist Print(sorted(dict_list, key=lambda x: x, reverse = True)) # Example 2: Sort list of dictionaries in descending order Print(sorted(dict_list, key=lambda x: x)) # Example 1: Sort list of dictionaries using sorted() & lambda
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