Python Coding challenge - Day 1104| What is the output of the following Python Code?

 

Code Explanation:

1️⃣ Creating an Empty List

funcs = []

Explanation

An empty list funcs is created.

It will store function objects.

2️⃣ Starting the Loop

for i in range(3):

Explanation

Loop runs 3 times.

Values of i:

0, 1, 2

3️⃣ Defining Function Inside Loop

def f():

    return i * i

Explanation ⚠️

A function f is defined in each iteration.

It returns i * i.

❗ BUT:

It does not store the value of i at that time.

It stores a reference to variable i (not value).

4️⃣ Appending Function to List

funcs.append(f)

Explanation

The function f is added to the list.

This happens 3 times → list contains 3 functions.

👉 All functions refer to the same variable i.

5️⃣ Loop Ends

After loop completes:

i = 2

6️⃣ Creating Result List

result = []

Explanation

Empty list to store outputs.

7️⃣ Calling Each Function

for fn in funcs:

    result.append(fn())

Explanation

Each stored function is called.

When called, each function evaluates:

i * i

👉 But current i = 2

So:

2 * 2 = 4

This happens for all 3 functions.

8️⃣ Printing Result

print(result)

📤 Final Output

[4, 4, 4]

 Book:  500 Days Python Coding Challenges with Explanation