Anonymous Functions

Using lambda keyword

An anonymous function is a single-expression function, having no name. The lambda keyword is used to declare the anonymous function. It can have any number of arguments but can have only one expression as stated above. Look at the simple example below and see how an anonymous function works.

x = lambda a: a+5 # anonymous function

The above anonymous function takes one argument a and returns a+5 (single expression).

The above anonymous function is similar to the following regular function defined using the def keyword:

def x(a):
    return a+5

So, the lambda keyword offers us a compact form to declare functions, as compared to the def keyword.

Calling an anonymous function

Run the following program.