What is the use of a lambda function in Python? Provide an example.

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Aryan Kumar · Answer

A lambda function is a small anonymous function. It is a way to define a function inline without having to give it a name. Lambda functions can be used anywhere that a regular function can be used, but they are especially useful in places where you only need to use the function once.

Here is an example of a lambda function:

Python

square = lambda x: x * x

print(square(5))

This code defines a lambda function called square that takes an argument x and returns the square of x. The lambda function is then called with the argument 5 and the result, 25, is printed to the console.

Here are some of the benefits of using lambda functions in Python:

They can be used to define small, one-line functions.
They can be used as arguments to other functions, such as map() and filter().
They can be used to make code more concise and readable.

Here are some examples of how lambda functions can be used in Python:

To define a function that takes an argument and returns the square of that argument:

Python

square = lambda x: x * x

To define a function that takes a list of numbers and returns a new list of the even numbers in the original list:

Python

even_numbers = list(filter(lambda x: x % 2 == 0, numbers))

To define a function that takes a string and returns a new string with all the vowels removed:

Python

no_vowels = lambda text: ''.join(c for c in text if c not in 'aeiouAEIOU')

As you can see, lambda functions can be used to simplify and improve the readability of Python code. They are a powerful tool that can be used in a variety of ways.

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