Python Coding challenge - Day 634| What is the output of the following Python Code?

 

Code Explanation:

 1. Define the Generator Function

def counter():

    i = 0

    while True:

        i = (yield i) or i + 1

What it does:

i = 0: Initializes the counter.

while True: Infinite loop for continuous counting.

yield i: Pauses and outputs the current value of i.

i = (yield i) or i + 1: After yielding, waits for send() input.

If something is sent (e.g., send(10)), i becomes that value.

If None is sent (like when using next()), it just does i + 1.

This is a generator that can accept values using .send()!

2. Create the Generator

c = counter()

Instantiates the generator.

Important: Generator doesn't run until you call next() or send(None).

 3. First next(c)

print(next(c))

What it does:

Starts the generator. Execution begins at i = 0.

Goes to yield i and yields 0.

Pauses at the yield, waiting for next input.

Output: 0

4. Send a New Value to the Generator

print(c.send(10))

What it does:

Resumes from the yield line.

send(10) assigns 10 to (yield i), so:

i = 10

Then loop continues → yield i → yields 10.

Output: 10

5. Next Increment (No send — just next())

print(next(c))

What it does:

Resumes again.

Since no value is sent, yield i receives None.

So:

i = None or i + 1

That becomes i = i + 1 = 11.

Output: 11

Final Output:

0

10

11

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