Python Coding Challenge - Question with Answer (ID -291225)

 

Explanation:

1. Create list a

a = [1, 2, 3]

A list named a is created with elements [1, 2, 3].

Indices:

a[0] = 1, a[1] = 2, a[2] = 3

a[-1] refers to the last element → 3.

2. Create empty list b

b = []

An empty list b is created to store the computed values.

3. Start the loop

for i in range(len(a)):

len(a) is 3, so loop runs for i = 0, 1, 2.

4. Multiply current element with last element

b.append(a[i] * a[-1])

Multiplies a[i] with the current last element of a (a[-1]).

The result is appended to list b.

5. Decrease the last element

a[-1] -= 1

The last element of a is reduced by 1 after each iteration.

This changes the value of a[-1] for the next loop cycle.

6. Print the result

print(b)

Prints the final contents of list b.

Loop Iteration Details

i a before a[i] a[-1] Calculation b after a after change

0 [1, 2, 3] 1 3 1 × 3 = 3 [3] [1, 2, 2]

1 [1, 2, 2] 2 2 2 × 2 = 4 [3, 4] [1, 2, 1]

2 [1, 2, 1] 1 1 1 × 1 = 1 [3, 4, 1] [1, 2, 0]

Final Output

[3, 4, 1]

Mastering Pandas with Python