LAMBDA FUNCTIONS IN PYTHON

A function which doesn’t contain any name explicitly is known as Lambda functions or Anonymous functions. Syntax –

Lambda arguments : expression

A lambda function can contain ‘n’ number or arguments. A lambda function can contain only one expression. After executing lambda function it will return the expression value.

Example –

a = lambda x : x*2
print a(5)

Output –

10

Note – The above lambda function is equal to the following code –

def a(x):
    return x*2
print a(5)

Note – Generally we use the lambda functions whenever we want to pass one 

function as parameter to another function.

Example – filter function

my_list=[1,2,3,5,6,8,9]
even_list=filter(lambda x : (x%2==0),my_list)
print even_list
odd_list=filter(lambda x : (x%2!=0),my_list)
print odd_list

Output –

[2, 6, 8]

[1, 3, 5, 9]