Python Coding challenge - Day 1145| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Generator Function Definition

def gen():

    for i in range(3):

        yield i

✅ Explanation:

gen() is a generator function because it uses yield.

It produces values one by one instead of returning all at once.

🔍 What it will generate:

0 → 1 → 2

🔹 2. Creating Generator Object

g = gen()

✅ Explanation:

Calling gen() does NOT run the function immediately.

It returns a generator object.

Execution starts only when iterated (next() or loop).

🔹 3. Iterating Using for Loop

for x in g:

    print(x)

🔍 What happens internally:

Python repeatedly calls:

next(g)

Step-by-step execution:

yield 0 → prints 0

yield 1 → prints 1

yield 2 → prints 2

Generator is exhausted → loop stops

✔️ Output so far:

0

1

2

🔹 4. Converting Generator to List

print(list(g))

🚨 Important:

Generator g is already exhausted after the loop

No values left to produce

🔍 So:

list(g) → []

🎯 Final Output

0

1

2

[]

Book:  700 Days Python Coding Challenges with Explanation