Lambda function in Python

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Hello guys, a lambda function in Python, also called an anonymous function, is a small, inline function that can be defined without a name. It is a way of creating a function that can be passed as an argument to another function or used as a one-liner. Lambda functions are typically used when you need a simple function that will be used only once and you don’t want to define a separate function for it.

The syntax for defining a lambda function is:

lambda arguments : expression

Here, arguments are the arguments that the function takes, separated by commas, and expression is the single expression that the function returns.

For example, consider a list of numbers and you want to sort them in descending order. You can use the sorted() function and pass a lambda function as the key argument:

numbers = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
sorted_numbers = sorted(numbers, key=lambda x: -x)
print(sorted_numbers)  # Output: [9, 6, 5, 5, 5, 4, 3, 3, 2, 1, 1]

In the above example, the lambda function lambda x: -x takes an argument x and returns its negation (-x). This means that the sorted() the function will sort the numbers in descending order.

Lambda functions can also be used as a shorthand for defining simple functions. For example, the following two functions are equivalent:

def square(x):
    return x * x

square = lambda x: x * x

So, in the end, it is generally recommended to use a regular named function for more complex logic or for functions that are used multiple times.

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Lingaraj Senapati

Hey There! I am Lingaraj Senapati, the Founder of My skills are Freelance, Web Developer & Designer, Corporate Trainer, Digital Marketer & Youtuber.

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