Practice Questions and Answers for Day 3 of Learning Python for Data Science

Test your Python skills with these 20 practice questions and solutions from Day 3 of Learning Python for Data Science. Covers string operations, data types, and more!

1. What will be the output of the following code?

x = 10
if x > 5:
    print("Greater")
else:
    print("Smaller")

Answer:

Greater

Explanation:

Since x = 10 is greater than 5, the condition if x > 5 is True, so "Greater" is printed.

2. Write a Python program using an if-else statement to check if a number is positive, negative, or zero.

Answer:

num = int(input("Enter a number: "))

if num > 0:
    print("Positive")
elif num < 0:
    print("Negative")
else:
    print("Zero")

Explanation:

• If num > 0, it prints "Positive".
• If num < 0, it prints "Negative".
• Otherwise, it prints "Zero".

3. What will be the output of the following code?

num = 7
if num % 2 == 0:
    print("Even")
else:
    print("Odd")

Answer:

nginxCopyEditOdd

Explanation:

7 % 2 equals 1, so the condition num % 2 == 0 is False, and the "Odd" statement is executed.

4. What will be the output of the following nested if condition?

x = 15
if x > 10:
    if x < 20:
        print("Between 10 and 20")

Answer:

sqlCopyEditBetween 10 and 20

Explanation:

Both conditions x > 10 and x < 20 are True, so the nested if block executes.

5. Write a Python program that uses nested if statements to check whether a given number is positive, even, and greater than 10.

Answer:

num = int(input("Enter a number: "))

if num > 0:
    if num % 2 == 0:
        if num > 10:
            print("Positive, Even, and Greater than 10")

Explanation:

• The first condition checks if the number is positive.
• The second condition checks if it’s even.
• The third condition checks if it’s greater than 10.

6. What is the output of the following program?

x = 5
y = 10
if x > 2:
    if y > 5:
        print("Valid")

Answer:

Valid

Explanation:

Since both x > 2 and y > 5 are True, the print statement executes.

7. Write a Python program that asks for a user’s age and prints their category.

Answer:

age = int(input("Enter your age: "))

if age <= 12:
    print("Child")
elif age <= 19:
    print("Teenager")
elif age <= 59:
    print("Adult")
else:
    print("Senior")

Explanation:

• It checks for age categories and prints the appropriate label.

8. What will be the output of the following code?

pythonCopyEditx = 50
if x >= 50:
    if x == 50:
        print("Exactly 50")
    else:
        print("Greater than 50")
else:
    print("Less than 50")

Answer:

nginxCopyEditExactly 50

Explanation:

Since x == 50, the "Exactly 50" statement executes.

9. Write a Python program using the pass statement inside an empty if condition.

Answer:

x = 10
if x > 5:
    pass  # Placeholder for future code
else:
    print("Smaller")

Explanation:

pass allows an empty block of code without errors.

10. What will the following program print?

pythonCopyEditx = 20
y = 30
if x < y:
    if x + 10 == y:
        print("Match")

Answer:

Match

Explanation:

Since x + 10 == y (20 + 10 = 30), the condition is True, so "Match" prints.

11. Write a Python program to check if a number is positive or negative using an if-else statement.

Answer:

num = int(input("Enter a number: "))

if num >= 0:
    print("Positive")
else:
    print("Negative")

12. Modify the code to use an elif condition to check for zero as well.

Answer:

num = int(input("Enter a number: "))

if num > 0:
    print("Positive")
elif num == 0:
    print("Zero")
else:
    print("Negative")

13. What is the output of this code snippet?

x = 10
if x > 5:
    print("High")
if x > 8:
    print("Higher")
if x > 15:
    print("Highest")

Answer:

High
Higher

Explanation:

Since x = 10, the first two if conditions are True, but the last one is False.

14. Write a program that checks if a number is divisible by both 2 and 3 using a nested if statement.

Answer:

num = int(input("Enter a number: "))

if num % 2 == 0:
    if num % 3 == 0:
        print("Divisible by both 2 and 3")

15. Write a Python program that checks if a number is a multiple of both 4 and 6 using a nested if statement.

Answer:

num = int(input("Enter a number: "))

if num % 4 == 0:
    if num % 6 == 0:
        print("Multiple of both 4 and 6")

16. Modify the program to check if a number is even and greater than 10.

Answer:

num = int(input("Enter a number: "))

if num % 2 == 0:
    if num > 10:
        print("Even and Greater than 10")

17. Write a Python program using if-elif-else conditions to categorize a number.

Answer:

num = int(input("Enter a number: "))

if num <= 10:
    print("Small")
elif num <= 50:
    print("Medium")
else:
    print("Large")

18. What is the output of this nested condition?

x = 3
y = 9
if x < 5:
    if y > 8:
        print("Success")

Answer:

Success

19. Modify the program to check if a number is between 10 and 50.

Answer:

num = int(input("Enter a number: "))

if 10 < num < 50:
    print("Between 10 and 50")

20. Write a Python program that checks if a number is prime using conditional statements.

Answer:

num = int(input("Enter a number: "))

if num > 1:
    for i in range(2, num):
        if num % i == 0:
            print("Not Prime")
            break
    else:
        print("Prime")

Conclusion

These practice questions cover Python string manipulation, type conversions, and essential built-in functions. Practicing them will help solidify your understanding of these fundamental concepts.

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