Python Coding challenge - Day 1151| What is the output of the following Python Code?

 

Code Explanation;

🔹 1. Class Definition

class Test:

✅ Explanation:

A class Test is created.

It contains a method named gen.

🔹 2. Generator Method Definition

def gen(self):

✅ Explanation:

gen is an instance method.

self refers to the current object.

⚠️ Important:

Since method contains yield,

it becomes a generator method.

🔹 3. Loop Inside Generator

for i in range(3):

✅ Explanation:

Loop runs for:

0, 1, 2

🔹 4. yield Statement

yield i

✅ Explanation:

yield returns one value at a time.

Function pauses after each yield.

State is remembered for next iteration.

🔹 5. Creating Object

obj = Test()

✅ Explanation:

Creates object obj of class Test.

🔹 6. Calling Generator Method

obj.gen()

✅ Explanation:

Does NOT immediately run method.

Returns a generator object.

🔹 7. for Loop Iteration

for x in obj.gen():

✅ Explanation:

Python internally keeps calling:

next(generator)

until generator is exhausted.

🔹 8. First Iteration

🔍 Execution:

Loop starts:

i = 0

yield 0

✔️ So:

x = 0

Printed:

0

🔹 9. Second Iteration

🔍 Execution:

Generator resumes:

i = 1

yield 1

Printed:

1

🔹 10. Third Iteration

🔍 Execution:

Generator resumes:

i = 2

yield 2

Printed:

2

🔹 11. Generator Exhausted

✅ Explanation:

Loop ends after i = 2

No more values

Python raises internal:

StopIteration

which automatically stops loop.

🎯 Final Output

0

1

2

Book:  700 Days Python Coding Challenges with Explanation