Practice Problems – Module 3 – Introduction to Python

Problem 1 Easy

Use print() with the sep parameter to display today's date in the format 03/21/2025 using three separate values for month, day, and year.

month = "03"
day = "21"
year = "2025"
print(month, day, year, sep="/")

03/21/2025

Problem 2 Easy

Print the words "Python", "is", "fun" on a single line using three separate print() calls and the end parameter.

print("Python", end=" ")
print("is", end=" ")
print("fun")

Python is fun

Problem 3 Easy

Write a program that asks the user for their name and prints a greeting using an f-string.

name = input("What is your name? ")
print(f"Hello, {name}! Welcome to Python!")

Problem 4 Easy

Ask the user for two numbers and print their sum. Remember that input() returns a string!

Convert the inputs to numbers using int() or float() before adding.

num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
print(f"{num1} + {num2} = {num1 + num2}")

Problem 5 Easy

Use an f-string to format the number 1234567.891 with commas and 2 decimal places.

number = 1234567.891
print(f"{number:,.2f}")

1,234,567.89

Problem 6 Medium

Write a tip calculator: ask for the bill amount and tip percentage, then display the tip amount and total, both formatted to 2 decimal places with a dollar sign.

Tip = bill * (percentage / 100). Use f"${value:.2f}" for currency formatting.

bill = float(input("Bill amount: $"))
tip_pct = float(input("Tip percentage: "))

tip = bill * (tip_pct / 100)
total = bill + tip

print(f"Tip:   ${tip:.2f}")
print(f"Total: ${total:.2f}")

Problem 7 Medium

Ask the user for their name and a number. Print their name repeated that many times, separated by spaces.

Use (name + " ") * n for repetition. Convert the number input to int().

name = input("Enter your name: ")
n = int(input("How many times? "))

print((name + " ") * n)

Problem 8 Medium

Display a student's score as a percentage. Ask for the points earned and total points possible. Format the result to 1 decimal place.

earned = float(input("Points earned: "))
total = float(input("Total points possible: "))

percentage = earned / total
print(f"Your score: {percentage:.1%}")

Points earned: 85
Total points possible: 100
Your score: 85.0%

Problem 9 Medium

Create a formatted table that shows 3 items with their prices, right-aligned. Use f-string alignment.

Use f"{'text':<width}" for left alignment and f"{'text':>width}" for right alignment.

print(f"{'Product':<15} {'Price':>10}")
print("-" * 26)
print(f"{'Notebook':<15} {'$4.99':>10}")
print(f"{'Pen Pack':<15} {'$2.49':>10}")
print(f"{'Eraser':<15} {'$0.99':>10}")

Product Price -------------------------- Notebook $4.99 Pen Pack $2.49 Eraser $0.99

Problem 10 Medium

Write a Mad Libs program that asks for a noun, verb, adjective, and place name, then prints a silly sentence using those words.

noun = input("Enter a noun: ")
verb = input("Enter a verb: ")
adjective = input("Enter an adjective: ")
place = input("Enter a place: ")

print(f"\nThe {adjective} {noun} decided to {verb} all the way to {place}!")

Problem 11 Medium

Use the .format() method (not f-strings) to print: "Hello, Alice! You scored 92.5% on the test."

name = "Alice"
score = 0.925
print("Hello, {}! You scored {:.1%} on the test.".format(name, score))

Hello, Alice! You scored 92.5% on the test.

Problem 12 Challenge

Write a program that asks for length and width in feet, then displays the area in both square feet and square meters (1 sq ft = 0.0929 sq m). Format numbers to 2 decimal places.

Calculate area in sq ft first, then multiply by 0.0929 for sq meters.

length = float(input("Enter length (ft): "))
width = float(input("Enter width (ft): "))

area_ft = length * width
area_m = area_ft * 0.0929

print(f"Area: {area_ft:.2f} sq ft")
print(f"Area: {area_m:.2f} sq m")

Problem 13 Challenge

Build a string incrementally using +=. Start with an empty string and add 5 lines to create a numbered list. The output should look like:

1. Learn Python 2. Practice daily 3. Build projects 4. Read documentation 5. Help others

goals = ""
goals += "1. Learn Python\n"
goals += "2. Practice daily\n"
goals += "3. Build projects\n"
goals += "4. Read documentation\n"
goals += "5. Help others"

print(goals)

Problem 14 Challenge

Create a temperature converter that asks for Celsius, then displays Fahrenheit and Kelvin. Use a bordered output with f-string formatting. Formula: F = C * 9/5 + 32, K = C + 273.15

celsius = float(input("Enter temperature in Celsius: "))

fahrenheit = celsius * 9 / 5 + 32
kelvin = celsius + 273.15

print()
print("=" * 30)
print("  Temperature Conversion")
print("=" * 30)
print(f"  Celsius:    {celsius:.1f} C")
print(f"  Fahrenheit: {fahrenheit:.1f} F")
print(f"  Kelvin:     {kelvin:.1f} K")
print("=" * 30)

Problem 15 Challenge

Create a mini invoice program. Ask the user for 3 item names and their prices. Display a formatted invoice with aligned columns and a total at the bottom.

Use f-string alignment: f"{'text':<20}" for left-aligned text and f"{value:>10.2f}" for right-aligned numbers.

item1 = input("Item 1 name: ")
price1 = float(input("Item 1 price: $"))
item2 = input("Item 2 name: ")
price2 = float(input("Item 2 price: $"))
item3 = input("Item 3 name: ")
price3 = float(input("Item 3 price: $"))

total = price1 + price2 + price3

print()
print("=" * 32)
print(f"{'INVOICE':^32}")
print("=" * 32)
print(f"  {item1:<20} ${price1:>7.2f}")
print(f"  {item2:<20} ${price2:>7.2f}")
print(f"  {item3:<20} ${price3:>7.2f}")
print("-" * 32)
print(f"  {'TOTAL':<20} ${total:>7.2f}")
print("=" * 32)

Practice Problems: Input, Output & String Formatting