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

 

Code Explanation:

🔹 1. Class Definition

class Test:

✅ Explanation:

A class named Test is created.

Inside this class, a method gen() is defined.

🔹 2. Generator Method Definition

def gen(self):

✅ Explanation:

gen is an instance method.

self refers to the current object.

⚠️ Important:

Because this method contains yield,

it becomes a generator method.

🔹 3. for Loop Inside Generator

for i in range(3):

✅ Explanation:

Loop runs 3 times:

0, 1, 2

🔹 4. yield Statement

yield i

✅ Explanation:

yield returns one value at a time.

After returning value, function pauses.

State is saved for next iteration.

🔹 5. Object Creation

obj = Test()

✅ Explanation:

Creates object obj of class Test.

🔹 6. Calling Generator Method

obj.gen()

✅ Explanation:

Method does NOT execute immediately.

It returns a generator object.

🔹 7. for Loop Iteration

for x in obj.gen():

✅ Explanation:

Python internally calls:

next(generator)

again and again.

🔹 8. First Iteration

🔍 Execution:

i = 0

yield 0

✔️ Printed:

0

Function pauses here.

🔹 9. Second Iteration

🔍 Execution resumes:

i = 1

yield 1

✔️ Printed:

1

Function pauses again.

🔹 10. Third Iteration

🔍 Execution resumes:

i = 2

yield 2

✔️ Printed:

2

🔹 11. Generator Ends

✅ Explanation:

Loop finishes after i = 2

Generator has no more values

Python raises internal:

StopIteration

The for loop automatically handles it and stops.

🎯 Final Output

0

1

2

Book:  500 Days Python Coding Challenges with Explanation