Type Conversion Quiz for Grade 8 Python

📚 Quick Study Guide: Python Type Conversion

• 💡 What is Type Conversion? It's when you change data from one type (like a whole number) to another (like text or a decimal number). For example, changing the integer $10$ to the string $"10"$.
• 🎯 Why is it Important? Python needs to know what kind of data it's working with. Converting types helps prevent errors and lets you combine different types of data correctly, like adding numbers or joining text.
• ↔️ Implicit vs. Explicit Conversion:
  • ✨ Implicit: Python sometimes does conversions automatically for you (e.g., $5 + 2.5$ becomes $7.5$, converting $5$ to a float).
  • 🛠️ Explicit: Most of the time, you need to tell Python exactly what to convert using special functions. This is what we'll focus on!
• ⚙️ Key Conversion Functions:
  • 🔢 int(): Converts a value to an integer (whole number).
    • Example: int(3.7) becomes $3$ (it truncates, doesn't round!).
    • Example: int("123") becomes $123$.
  • 📈 float(): Converts a value to a floating-point number (decimal number).
    • Example: float(5) becomes $5.0$.
    • Example: float("2.5") becomes $2.5$.
  • 📝 str(): Converts a value to a string (text).
    • Example: str(100) becomes $"100"$.
    • Example: str(True) becomes $"True"$.
• ⚠️ Common Errors to Watch Out For:
  • 🚫 ValueError: Happens when you try to convert a string into a number type, but the string doesn't look like a valid number (e.g., int("hello")).
  • 🛑 TypeError: Occurs when you try to perform an operation on incompatible data types without converting them first (e.g., $"hello" + 5$).

🧠 Practice Quiz: Python Type Conversion for Grade 8

Choose the best answer for each question.

1. What is the output of print(type(str(123)))?

   A) <class 'int'>

   B) <class 'float'>

   C) <class 'str'>

   D) <class 'bool'>

2. Which Python function is used to convert a value to an integer?

   A) to_int()

   B) integer()

   C) int()

   D) convert_int()

3. What will be the result of int("3.14")?

   A) 3

   B) 3.14

   C) ValueError

   D) TypeError

4. If x = 10 (an integer), how would you convert x to a float?

   A) float(x)

   B) str(x)

   C) int(x)

   D) x.to_float()

5. What is the output of print("5" + str(5))?

   A) 10

   B) "55"

   C) ValueError

   D) TypeError

6. Which of the following will correctly convert the string "42" to an integer?

   A) int("42.0")

   B) int("forty-two")

   C) int("42")

   D) int(42.5)

7. What happens when you try to convert a string that contains letters (e.g., "hello") to an integer using int("hello")?

   A) It converts to 0.

   B) It converts to 1.

   C) A TypeError occurs.

   D) A ValueError occurs.