Python Coding Challenge - Question with Answer (ID 051026)

 

Explanation:

🟢 Step 1: Create the List

x = [10, 20, 30]

The list has these indexes:

Index:   0    1    2

Value:  10   20   30

So:

- x[0] → 10

- x[1] → 20

- x[2] → 30

🟡 Step 2: Understand x[True]

x[True]

In Python, bool behaves like an integer:

True = 1

False = 0

Therefore:

x[True]

is equivalent to:

x[1]

So:

x[True] → 20

🔵 Step 3: Understand x[False]

x[False]

Since:

False = 0

we get:

x[False] → x[0] → 10

🟣 Step 4: Understand x[-1]

x[-1]

-1 always refers to the last element of a list.

Therefore:

x[-1] → 30

🟠 Step 5: Substitute the Values

Original expression:

print(x[True] * x[False] - x[-1])

Replace each part:

20 * 10 - 30

🔴 Step 6: Multiplication First

According to operator precedence, * is evaluated before -.

20 * 10 = 200

So the expression becomes:

200 - 30

🟢 Step 7: Subtraction

200 - 30 = 170

Therefore Python executes:

print(170)

🎯 Final Output

170

Books: 100 Senior-Level Python Interview Questions (Basic to Advanced)