Python Casting

Convert between types.

✍️ 3 exercises + code challenge in this lesson

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Casting means converting a value to another type using constructor functions:

int("10") → 10, int(3.9) → 3 (truncates)
float("2.5") → 2.5, float(3) → 3.0
str(42) → "42"
bool(0) → False

Converting an invalid string, like int("abc"), raises a ValueError.

Key Takeaways: Python Casting

Mastering Python Casting helps you write clean and reliable Python code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

Python Casting Code Example

Python

print(int("10") + 5)
print(int(3.9))
print(float("2.5") * 2)
print(str(42) + " is the answer")
print(bool(0), bool(""), bool("hi"))

try:
    int("abc")
except ValueError as e:
    print("Error:", e)

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Python Casting Practice Exercises

Check what you learned in “Python Casting”.

/ 3 solved

Fill in the blank

Convert the string to an integer.

age = ("25")

✓ Correct! Not quite. Try again.

Multiple choice

What does int(9.99) return?

9 10 9.99 Error

✓ Correct! Not quite. Try again.

Code challenge

Convert "10" and "5" to integers and print their sum.

Write the code in the live editor. Your answer is checked automatically.

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Python Casting

💡 Key Takeaways: Python Casting

Python Casting Code Example

Python Casting Practice Exercises

Key Takeaways: Python Casting