Python Coding Challenge - Question with Answer (01261125)

 

Explanation:

🔹 Line 1: Creating a Nested List

data = [[1,2], [3,4], [5,6]]

Explanation

data is a list of lists (nested list).

It contains three separate sublists.

Each sublist holds two numbers.

We will later flatten these sublists into one single list.

🔹 Line 2: Creating an Empty Output List

flat = []

Explanation

flat is an empty list.

This list will store all numbers from the nested structure after flattening.

It starts empty and will be filled step by step.

🔹 Line 3: Flattening Using map() With Lambda

list(map(lambda x: flat.extend(x), data))

Explanation

This is the most important line. Here’s how it works:

A. map()

map() loops over each sublist inside data.

B. lambda x

x represents each sublist from data, one at a time:

First: [1, 2]

Second: [3, 4]

Third: [5, 6]

C. flat.extend(x)

.extend() adds each element of x into flat.

It does not add the sublist — it adds the individual numbers.

D. How flat changes

Step Value of x flat after extend

1 [1, 2] [1, 2]

2 [3, 4] [1, 2, 3, 4]

3 [5, 6] [1, 2, 3, 4, 5, 6]

E. Why list(...) ?

map() doesn’t run immediately.

Wrapping it with list() forces all iterations to execute.

🔹 Line 4: Printing the Final Output

print(flat)

Explanation

Prints the fully flattened list.

All nested values are now in one single list.

🎉 Final Output

[1, 2, 3, 4, 5, 6]

APPLICATION OF PYTHON FOR GAME DEVELOPMENT