Lambda Functions in Python

Lambda functions are small anonymous functions used for short, one-line operations. They are commonly used with functions like map(), filter(), and sorted().

What is a Lambda Function?

A lambda function is a function without a name, written in a single line. It can take any number of arguments but only one expression.

# normal function
def square(x):
    return x * x

# lambda function
square = lambda x: x * x

print(square(5))
        

Lambda with Multiple Arguments

Lambda functions can take more than one argument.

add = lambda a, b: a + b
print(add(3, 7))
        

Lambda with map()

map() applies a function to every item in an iterable.

numbers = [1, 2, 3, 4, 5]

squares = list(map(lambda x: x * x, numbers))

print(squares)
        

Lambda with filter()

filter() selects elements that satisfy a condition.

numbers = [1, 2, 3, 4, 5, 6]

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

print(even_numbers)