How to sort a list in python using lambda functions

Veröffentlicht am: 20 August 2024
auf dem Kanal: CodeLink

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certainly! sorting a list in python can be accomplished easily using the built-in `sort()` method or the `sorted()` function. to customize the sorting behavior, you can use a `lambda` function as the key for sorting.

what is a lambda function?

a lambda function is an anonymous function defined with the `lambda` keyword. it can take any number of arguments but can only have one expression. lambda functions are often used for short, throwaway functions that you do not wish to define with a full `def` statement.

sorting with a lambda function

when sorting a list, you can specify a `key` parameter that determines the sorting criteria. a `lambda` function can be provided as this key to control how the elements are compared.

example: sorting a list of tuples

let's look at an example where we have a list of tuples representing (name, age) pairs, and we want to sort this list by age.

#### step 1: define the list

#### step 2: sort the list using a lambda function

to sort this list by the second element of each tuple (the age), we can use the `sorted()` function along with a `lambda` function:

#### output

explanation

1. **`sorted()` function**: this built-in function returns a new sorted list from the elements of any iterable.
2. **`key` parameter**: the `key` parameter allows us to specify a function to be called on each element prior to making comparisons.
3. **`lambda person: person[1]`**: this lambda function extracts the second element (age) from each tuple for comparison purposes.

example: sorting in reverse order

if you want to sort the list in reverse order (from oldest to youngest), you can set the `reverse` parameter to `true`:

#### output

example: sorting a list of dictionaries

you can also sort a list of dictionaries. for instance, let's say we have a list of employees represented as dictionaries, and we want to sort them by their salary:

#### output

conclusion

using `lambda` functions with sorting met ...

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