Lambda Expression in Python.

Introducing Lambda Expression in Python:

• Lambda is an Anonymous Function
• Doesn't require a return anything.
• Lambdas are single line function.
• Can only be used as the subtitle for basic function.
• Cannot a docstring.
• Note that functions created with lambda expressions cannot contain statements or annotations.

The expression lambda arguments: expression yields a function object. The unnamed object behaves like a function object defined with:
def <lambda>(arguments)
                 return expression

Syntax for Lambda Expression:

 lambda arguments: expression

Example of Lambda and Function:

Aim: Write a Python Code for an addition of three numbers:

def addition(x,y,z):

    return x+y+z    #return addition of three numbers

print(addition(10,20,30))#gives you 60

Using Lambda Expression:

fun=lambda x,y,z:x+y+z """object_iterator_name=lambda arguments: expression"""

print(fun(12,10,20) #prints 42

Description:

In above programs our aim to an addition of the three numbers, so we can do it through many ways. In the second example, fun is the object name of lambda as others are in python and after assignment operator(=) starts with lambda keyword and put arguments as we define in function arguments after it.After put ":" (symbol) can identify python that arguments are ended and expression part become start and put expression after this symbol(":").

Few More Example of Lambda Expression in Python:

• Lambda Expression in Python good for,

>>> sorted(range(-5, 6), formula=lambda x: x ** 2)

[0, -1, 1, -2, 2, -3, 3, -4, 4, -5, 5]

• Lambda Expression in Python where might not be work properly because of makes some bugs,

>>> class Car:...     lever = lambda self: print('Wroom!')...     crashing = lambda self: print('Boom!')>>> my_car = Car()>>> my_car.crashing()'Boom!'