Python Coding challenge - Day 568| What is the output of the following Python Code?

 

Code Explanation:

1. Function Definition: Outer Function

def make_adder(n):

This defines a function named make_adder that takes one argument n.

n will be used to create a customized "adder" function.

2. Function Definition: Inner Function (Closure)

    def adder(x):

        return x + n

Inside make_adder, another function adder is defined.

adder takes a parameter x and returns the sum of x and n.

Note: n is not defined inside adder — it's taken from the enclosing scope (i.e., make_adder). This is called a closure.

3. Return the Inner Function

    return adder

make_adder returns the function adder, not the result of calling it.

The returned function "remembers" the value of n even after make_adder has finished executing.

4. Create a New Function using make_adder

add5 = make_adder(5)

Calls make_adder(5), which returns a function adder where n is permanently set to 5.

Now, add5 is a function that adds 5 to its input.

5. Call the New Function

print(add5(10))

Calls the add5 function with input 10.

Inside add5, x = 10 and n = 5 (from the closure).

So it computes 10 + 5 = 15.

print outputs:

15

Download Book - 500 Days Python Coding Challenges with Explanation