Python Coding challenge - Day 1152| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Generator Function Definition

def gen():

✅ Explanation:

A generator function gen() is created.

Since it uses yield, it becomes a generator.

🔹 2. Receiving Value with yield

x = yield

✅ Explanation:

This is a special use of yield.

🔍 What it does:

Pauses generator execution

Waits to RECEIVE a value using:

send(value)

The received value gets stored in:

x

🔹 3. Second yield

yield x * 2

✅ Explanation:

Multiplies received value by 2

Returns result using yield

🔹 4. Creating Generator Object

g = gen()

✅ Explanation:

Calling gen() does NOT run function immediately.

It creates a generator object g.

🔹 5. Starting Generator

next(g)

✅ Explanation:

Before using:

send(value)

generator must first reach the first yield.

🔍 What happens internally:

Execution starts:

x = yield

Generator pauses here waiting for value.

⚠️ Important:

At this moment:

x → not assigned yet

Generator is now ready to receive data.

🔹 6. Sending Value into Generator

g.send(5)

✅ Explanation:

Sends value 5 into paused generator.

That value becomes:

x = 5

🔹 7. Execution Resumes

After receiving value:

yield x * 2

Calculation:

5 * 2 = 10

Generator yields:

10

🔹 8. Printing Result

print(g.send(5))

✅ Output:

10

🎯 Final Output

10

Book: 900 Days Python Coding Challenges with Explanation