Reference library

Errors & debugging

Handle failures gracefully and write clearer error messages for future you.

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Errors & debugging medium

Raise a clear custom error

Validate input early and raise ValueError with a helpful message.

errors raise validation

Python

def positive_only(n):
    """Return n if it is strictly positive."""
    if n <= 0:
        raise ValueError(f"Expected a positive number, got {n}")
    return n


print(positive_only(5))
try:
    positive_only(-1)
except ValueError as exc:
    print(exc)

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