Python Coding challenge - Day 1163| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Generator Function Definition

def gen():

✅ Explanation:

A function named gen() is created.

Since it contains yield, it becomes a generator function.

Calling it will return a generator object.

🔹 2. First yield

yield 1

✅ Explanation:

Generator produces the value:

1

Then pauses execution.

🔹 3. yield from

yield from [2, 3]

✅ Explanation:

yield from is a shortcut for yielding all values from another iterable.

Python internally treats it like:

for x in [2, 3]:

    yield x

🔍 First value from list

2

is yielded.

Generator pauses.

🔍 Second value from list

3

is yielded.

Generator pauses again.

🔹 4. Final yield

yield 4

✅ Explanation:

After yield from finishes,

generator yields:

4

🔹 5. Calling Generator

gen()

✅ Explanation:

Does NOT execute immediately.

Creates a generator object.

Something like:

<generator object gen at 0x...>

🔹 6. Converting to List

print(list(gen()))

✅ Explanation:

list() consumes the entire generator.

It collects every yielded value.

Values generated in order:

First:

yield 1

Output:

1

Second:

yield from [2,3]

Outputs:

2

3

Third:

yield 4

Output:

4

🔹 7. Final List

Collected values:

[1, 2, 3, 4]

🎯 Final Output

[1, 2, 3, 4]

Book:  500 Days Python Coding Challenges with Explanation