Python Coding Challenge - Question with Answer (ID 271026)

 

Explanation:

1. Understanding True and False

In Python, bool is a subclass of int.

- True behaves numerically like 1.

- False behaves numerically like 0.

For example:

print(int(True))   # 1print(int(False))  # 0

This means Boolean values can participate in arithmetic operations.

2. Understanding the Bitwise NOT Operator (~)

Consider this part of the expression:

~True

Since True behaves like integer 1, this becomes:

~1

For Python integers, the bitwise NOT operator follows this identity:

\[

\sim x = -x - 1

\]

Therefore:

\[

\sim 1 = -1 - 1 = -2

\]

So the result is:

~True  # -2

3. Understanding Multiplication

Now consider:

~True * 2

We already know that ~True evaluates to -2.

Therefore:

\[

-2 \times 2 = -4

\]

The result of this part is -4.

4. Understanding the Logical OR Operator (or)

Next, evaluate:

False or 3

Python's or operator returns the first truthy operand, or the last operand if none is truthy.

- False is a falsy value.

- Python therefore evaluates and returns 3, which is truthy.

Thus:

False or 3  # 3

5. Understanding Operator Precedence

The original expression is:

~True * 2 + (False or 3)

Python evaluates the parenthesized expression, the bitwise operation, multiplication, and then addition according to the operator precedence rules.

Substituting the calculated values gives:

-4 + 3

Now perform the addition:

\[

-4 + 3 = -1

\]

6. Understanding the print() Function

print(~True * 2 + (False or 3))

The print() function displays the final calculated integer.

Final output:

-1

Books: Mastering Pandas with Python