B2.1 Broken Code challenges - Python

B2.1.1: Data Types & Variables

# Topic B2.1.1: Variables & Data Types
# CHALLENGE: We want to print a birthday message.
# But this code crashes with a "TypeError".
# Fix the code to make the data types compatible.

name = "Sam"
age = 17

# BUG IS HERE
message = "Happy Birthday " + name + ", you are now " + age

print(message)

B2.1.2: String Manipulation (Substrings)

# Topic B2.1.2: String Manipulation
# CHALLENGE: We want to extract the DOMAIN from an email.
# Input: "[email protected]"
# Target Output: "school.com"
# Actual Output: "@school.com" (It includes the @ symbol!)
# Why is the slice capturing the separator?

email = "[email protected]"

# Find the position of the "@" symbol (Index 7)
at_symbol_index = email.find("@")

domain = email[at_symbol_index:] 

print("Domain:", domain)

B2.1.3: Exception Handling

# Topic B2.1.3: Exception Handling
# CHALLENGE: This calculator crashes if the user enters 0 as the second number.
# (ZeroDivisionError).
# Wrap the dangerous code in a try/except block to handle the error nicely.

print("Division Calculator")
num1 = int(input("Enter top number: ")) # e.g. 10
num2 = int(input("Enter bottom number: ")) # e.g. 0

# BUG: This line is unprotected!
result = num1 / num2

print("Result:", result)

B2.1.4: Debugging (Trace Tables)

# Topic B2.1.4: Debugging & Tracing
# CHALLENGE: This code calculates the average of a list of grades.
# But the result is always wrong!


grades = [80, 90, 70, 100]
count = len(grades)

for grade in grades:

    total_score = 0
    total_score = total_score + grade
    print(f"Current Grade: {grade}, Running Total: {total_score}")

average = total_score / count
print("Final Average:", average)