How Can I Sort a Python List by Multiple Fields Using Lambda Functions?

Sorting a Python List by Multiple Fields

You have a Python list created from a sorted CSV file using the itemgetter operator. While the list is already sorted by the value in the second field, you want to enhance the sorting to include the first field as well.

To achieve this, you can leverage lambda functions. They allow you to define a custom sorting key that considers multiple criteria.

The following code provides a solution:

sorted_list = sorted(list1, key=lambda x: (x[0], x[1]))

Here's how it works:

• lambda x: (x[0], x[1]) defines a lambda function that returns a tuple containing the values from the first and second fields.
• sorted_list = sorted(list1, key=lambda x: (x[0], x[1])) uses this lambda function as the sorting key, resulting in a list sorted by both the first and second fields.

By using lambda functions, you can easily define complex sorting criteria and sort your Python lists according to your specific requirements.

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