Python Coding challenge - Day 1149| What is the output of the following Python Code?

 

Code Explanation:

1. Generator Function Definition

def gen():

✅ Explanation:

A function gen() is created.

Since it contains yield, it becomes a generator function.

⚠️ Important:

Generator functions do NOT run immediately.

They return a generator object.

🔹 2. First Print Statement

print("A")

✅ Explanation:

When execution starts, "A" will be printed first.

🔹 3. First yield

yield 1

✅ Explanation:

yield returns a value (1)

Then pauses the function

Function state is remembered

🔹 4. Second Print Statement

print("B")

✅ Explanation:

This line runs only when generator resumes after first pause.

🔹 5. Second yield

yield 2

✅ Explanation:

Returns 2

Again pauses the generator

🔹 6. Creating Generator Object

g = gen()

✅ Explanation:

gen() is called

But function body does NOT execute yet

A generator object g is created

🔹 7. First next() Call

print(next(g))

🔍 What happens internally:

Generator starts execution from beginning.

Step-by-step:

Executes:

print("A")

Output:

A

Reaches:

yield 1

Returns:

1

Generator pauses here

✔️ Output so far:

A

1

🔹 8. Second next() Call

print(next(g))

🔍 What happens internally:

Generator resumes from where it paused.

Step-by-step:

Executes:

print("B")

Output:

B

Reaches:

yield 2

Returns:

2

Generator pauses again

🎯 Final Output

A

1

B

2

Book: 900 Days Python Coding Challenges with Explanation