Python Coding challenge - Day 1183| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Importing islice

from itertools import islice

✅ Explanation:

islice() is imported from Python's itertools module.

It works like list slicing ([start:end]) but on iterators.

It returns only a selected portion of an iterable.

Think of it as:

Original Data

↓

Take Some Part

↓

Return Only That Part

🔹 2. Creating a Range Object

nums = range(10)

✅ Explanation:

range(10) generates numbers from:

0 to 9

Current values:

Index   Value

0       0

1       1

2       2

3       3

4       4

5       5

6       6

7       7

8       8

9       9

Visual:

nums

[0,1,2,3,4,5,6,7,8,9]

🔹 3. Calling islice()

islice(nums, 2, 5)

✅ Explanation:

Syntax:

islice(iterable, start, stop)

Here:

islice(nums, 2, 5)

means:

Start from index 2

Stop before index 5

Exactly like:

nums[2:5]

🔹 4. Skip First Two Elements

Python skips:

Index 0 → 0

Index 1 → 1

Ignored values:

0

1

🔹 5. Take Element at Index 2

Current index:

2

Value:

2

Selected:

2 ✅

🔹 6. Take Element at Index 3

Current index:

3

Value:

3

Selected:

3 ✅

🔹 7. Take Element at Index 4

Current index:

4

Value:

4

Selected:

4 ✅

🔹 8. Stop Before Index 5

islice() stops before:

Index 5

So:

5 ❌

6 ❌

7 ❌

8 ❌

9 ❌

are never included.

🔹 9. Convert Iterator to List

list(islice(nums, 2, 5))

✅ Explanation:

islice() returns an iterator.

Selected values:

2

3

4

Converted into:

[2, 3, 4]

🔹 10. Print Result

print(list(islice(nums, 2, 5)))

Prints:

[2, 3, 4]

🎯 Final Output

[2, 3, 4]

Book: 
107 Pattern Plots Using Python