How to Sort a List of Dictionaries by Value in Python?

Sorting a List of Dictionaries by Dictionary Value in Python

Sorting a list of dictionaries by the value of a specific key is a common task in Python programming. This allows you to organize the dictionaries in a meaningful order, such as alphabetically by name or numerically by age.

Solution

To sort a list of dictionaries by the value of a specific key, you can use the sorted() function with the key= parameter. This parameter takes a function that extracts the value of the desired key from each dictionary.

Using a Lambda Function

One way to do this is to use a lambda function, which is an anonymous function without a name. For example, to sort the given list of dictionaries by the 'name' key:

newlist = sorted(list_to_be_sorted, key=lambda d: d['name'])

Using operator.itemgetter

Alternatively, instead of defining your own function, you can use the operator.itemgetter function, which provides a convenient way to extract values from objects. For example:

from operator import itemgetter
newlist = sorted(list_to_be_sorted, key=itemgetter('name'))

Reverse Sorting

If you want to sort in descending order, you can add the reverse=True argument to the sorted() function:

newlist = sorted(list_to_be_sorted, key=itemgetter('name'), reverse=True)

This will return a new list containing the sorted dictionaries. The original list remains unmodified.

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