Lambda function

What is a lambda function?

Lambda function is like anonymous function is other programming languages. It's basically a inline function that has no name. You can say function oneliner 😎

add = lambda x, y: x + y
print(add(5, 2))

The example above takes two arguments x and y and immediately returns the result of x + y.

Different Usecaes

Lambda functions are used where a single line function is sufficient to do the job.

Like the sort as below

sort_by_2nd_value = [(4, 20), (2, 1), (5, 10), (1, 3)]
sort_by_2nd_value.sort(key=lambda x: x[1])
print(sort_by_2nd_value)

Can be used in map, filter and reduce

print(sort_by_2nd_value)
from functools import reduce
print(reduce(lambda x, y: x + y, [1, 1, 1, 1, 1]))