Python Control Flow: Conditional Statements Questions and Answers

Question 1

What is the output of the following Python code snippet?

```python
temperature = 25
if temperature > 30:
    print("Hot")
elif temperature > 20:
    print("Warm")
else:
    print("Cold")
```

Accepted Answer

Warm

Answer

The code first checks if `temperature` (25) is greater than 30, which is false. It then proceeds to the `elif` condition, checking if 25 is greater than 20. This is true, so it prints "Warm" and exits the conditional block. The `else` block is never reached.

Question 2

Which of the following code snippets correctly uses the ternary operator to assign 'Adult' to the `status` variable if `age` is 18 or greater, and 'Minor' otherwise?

Accepted Answer

status = 'Adult' if age >= 18 else 'Minor'

Answer

The correct syntax for Python's ternary conditional operator is `value_if_true if condition else value_if_false`. This allows for a concise, one-line conditional assignment.

Question 3

A programmer wants to write a script to check for a specific error condition. The program should print 'Error Found' only if `error_code` is not 0 AND `is_critical` is True. Which of the following conditional statements accomplishes this?

Accepted Answer

if error_code != 0 and is_critical:
    print("Error Found")

Answer

The `and` logical operator returns True only if both conditions on its left and right are true. The code `if error_code != 0 and is_critical:` correctly checks if the error code is non-zero and the `is_critical` flag is True. Comparing a boolean variable to `True` with `== True` is redundant.

Question 4

What will be printed to the console when the following Python code is executed?

```python
x = 10
y = 20

if x > 5:
    print("A")
    if y > 15:
        print("B")
elif x > 8:
    print("C")
else:
    print("D")
```

Accepted Answer

A
B

Answer

The first condition `if x > 5` (10 > 5) is true, so the program enters its block and prints "A". Inside this block, there is a nested `if` statement. It checks `if y > 15` (20 > 15), which is also true, so it prints "B". Since the initial `if` statement was true, the `elif` and `else` blocks are skipped entirely.

Question 5

In Python, what is the primary purpose of the `elif` keyword in a conditional statement?

Accepted Answer

To check multiple distinct conditions in sequence without excessive nesting.

Answer

The `elif` (else if) keyword allows you to check for multiple conditions sequentially. Python evaluates the `if` condition, then each `elif` condition in order, until one is found to be true. If none are true, the `else` block is executed. This avoids deeply nested `if` statements, making the code more readable.

Python Practice Test

Python Practice Test

Python Control Flow: Conditional Statements Questions and Answers