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Python Type Hinting

Add static type annotations and validate with mypy.

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Python 3.5+ supports optional type hints (PEP 484). Type hints help IDEs provide better autocomplete and static analysis tools like mypy detect type mismatch bugs before runtime.

Key Takeaways: Python Type Hinting

Mastering Python Type Hinting 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 Type Hinting Code Example

Python 
from typing import List, Optional

def calculate_average(scores: List[float]) -> Optional[float]:
    if not scores:
        return None
    return sum(scores) / len(scores)

print("Average score:", calculate_average([92.5, 88.0, 95.5]))
Output
Average score: 92.0
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