Python Coding challenge - Day 1146| What is the output of the following Python Code?

 

 Code Explanation:

🔹 1. Outer Function Definition

def outer(x):

✅ Explanation:

A function outer is defined.

It takes one argument: x.

This function will return another function.

🔹 2. Inner Function Definition

def inner(y):

✅ Explanation:

Inside outer, another function inner is defined.

It takes parameter y.

🔹 3. Using Outer Variable Inside Inner

return x + y

✅ Explanation:

inner uses:

y → its own parameter

x → from outer function

👉 This is called a closure:

Inner function remembers the value of x even after outer finishes

🔹 4. Returning Inner Function

return inner

✅ Explanation:

outer does NOT return a value directly

It returns the function inner itself

🔹 5. Calling Outer Function

f = outer(5)

🔍 What happens:

outer(5) is executed

x = 5

Returns inner function

👉 Now:

f → inner (with x = 5 stored)

🔹 6. Calling Returned Function

print(f(3))

🔍 What happens:

Calls:

inner(3)

Inside inner:

x = 5 (remembered from closure)

y = 3

Calculation:

5 + 3 = 8

🎯 Final Output

8

Book:  500 Days Python Coding Challenges with Explanation