Another condition for this is for that key to be common in all the dictionaries in the list. We can sort a list based on the key’s value. However, it is not simple to compare dictionary instances using the comparison operator we need to use the key parameter. python list sorting dictionary Share Follow edited at 23:08 Prune 76. We can get an advantage by using the sorted() function to sort the list of dictionaries. KeyError: 1 Second attempt: import operator result sorted (myAccountsValues, keyitemgetter ('percent')) which fails to sort on percentage. We can also specify a key parameter that provides a function to decide the order of the elements. It can sort the list in ascending or descending order. In this article we will discuss how we can sort a dictionary. This function takes an existing list and returns a sorted list. Sort function is one such function for a dictionary in python. Use the sorted() Function to Sort a List of Dictionaries in Python It is the unordered collection of the data and allows storing duplicate values, but the key must be unique. See the following article for more information. By specifying a function to be applied to each element of the list, it is sorted according to the result of that function. It is mutable in nature, which means we can change data after its creation. To sort a list of dictionaries according to the value of the specific key, specify the key parameter of the sort () method or the sorted () function. Finally, we print ‘sorteddict‘ using the ‘print()‘ function. We then use the ‘dict()‘ function to convert the sorted list of tuples back to a dictionary, and assign it to ‘sorteddict‘. This tutorial illustrates how to sort a list of dictionaries in Python. How to sort a dictionary in Python Python dictionary is the collection of data which stored in the key-value form. The result of ‘sorted()‘ is a list of tuples, where each tuple contains a key-value pair from the dictionary, sorted by value. Lists can also store other objects, like dictionaries that contain key-value pairs. Use the sort() Function to Sort a List of Dictionaries in PythonĪ list is a linear collection object in Python that can emulate arrays by storing every element at a particular index.Use the sorted() Function to Sort a List of Dictionaries in Python.Save my name, email, and website in this browser for the next time I comment. Your email address will not be published. Pass the specified key into the index () function, it will check the passed key is exist in the list and return the index position of the passed key. Then use the list.index () function to get the index position of the specified key in the dictionary. Note that since score is a string value, it needs to be converted to float for comparison. First, using list () function you can convert the dictionary to a list of keys. The sort() method when invoked on the list of dictionaries with the getVal() function as an input argument for the parameter “ key”, will sort the list as follows. 4 Answers Sorted by: 11 You can sort by a tuple: sorted (l, keylambda k: (float (k 'score'), k 'id'), reverseTrue) This will sort by score descending, then id descending. After that, we will pass the getVal() function to the sort() method as an input argument for the parameter key. Here, we have to keep in mind that the key of the key-value pair that is to be used for comparing the dictionaries must be present in all the dictionaries in the list.įor instance, if we have to sort the dictionaries of laptops according to their RAM value, we will first create a function getVal() that takes a dictionary as input and returns the value associated with the key “ RAM” of the dictionary. We will choose a specific key-value pair from the dictionaries that will be used as the key for sorting the list of dictionaries. To sort a list of dictionaries in python, we will have to specify the key according to which the dictionaries will be sorted. Usually it’s less convenient than sorted () - but if you don’t need the original list, it’s slightly more efficient. It modifies the list in-place (and returns None to avoid confusion). How to Sort List of Dictionaries in Python? You can also use the list.sort () method. After finding the dictionary to be updated, we just update the desired key. In the code, you can observe that we have to perform the search operation to select the dictionary to update. In the output, we have printed the RAM of laptop1 before and after updating it.
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