Python Anonymous/Lambda Function
Lambda functions are anonymous, they have no names. It’s a one-line function.
Syntax of Lambda Function in python
lambda arguments: expression
Where
lambda: is a keyword
arguments: all the parameters which we need in the expression
expression: python expression to compute the return value
Note: lambda always returns only one value.
Examples:
- lambda function with one argument
x = lambda a : a + 10
print(x(15))
Output is: 25
2. lambda function with 2 arguments.
x = lambda a, b : a * b
print(x(2, 4))
Output is: 8
3. lambda function with 3 arguments.
x = lambda a, b, c : a * b * c
print(x(1, 2, 3))
output is: 6
# Arguments
Like a normal function object defined with def, Python lambda expressions support all the different ways of passing arguments. This includes:
Positional arguments
(lambda a, b, c: a+ b+ c)(1, 2, 3)
Output is: 6
Named arguments (sometimes called keyword arguments)
(lambda a,b,c=4: a + b+ )(2, 3)
output is: 9
Variable list of arguments (often referred to as varargs)
(lambda a,b,c=4: a + b+ c)(2, b=3)
Output is: 9
Variable list of keyword arguments
(lambda *args: sum(args))(1,2,3,4,5)
Output is: 15
Keyword-only arguments
(lambda **kwargs: sum(kwargs.values()))(one=1, two=2, three=3)
Output is: 6