Lambda Functions

Sometimes you may need to define small one-action function. Especially it's quite useful for preprocessing data. In this case, you can use lambda function.

Lambda function is a small anonymous function (unless you assign it to some variable) that can have many arguments, but only one expression/instruction. To define lambda function use the keyword lambda followed by arguments. Next, set the colon sign, and define the instruction. For example, the circle_area function can be expressed as lambda:


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# Import the library
import math

# Define lambda function
area = lambda R: print("Area:", math.pi*R**2)

# Calling function
area(5)
area(8)

Tudo estava claro?

Seção 4. Capítulo 7