TheAlgorithms/Python · error · ValueError

The Denominator Cannot be less than 0

Error message

The Denominator Cannot be less than 0

What it means

Error "The Denominator Cannot be less than 0" thrown in TheAlgorithms/Python.

Source

Thrown at maths/numerical_analysis/proper_fractions.py:27

    >>> proper_fractions(10)
    ['1/10', '3/10', '7/10', '9/10']
    >>> proper_fractions(5)
    ['1/5', '2/5', '3/5', '4/5']
    >>> proper_fractions(-15)
    Traceback (most recent call last):
        ...
    ValueError: The Denominator Cannot be less than 0
    >>> proper_fractions(0)
    []
    >>> proper_fractions(1.2)
    Traceback (most recent call last):
        ...
    ValueError: The Denominator must be an integer
    """

    if denominator < 0:
        raise ValueError("The Denominator Cannot be less than 0")
    elif isinstance(denominator, float):
        raise ValueError("The Denominator must be an integer")
    return [
        f"{numerator}/{denominator}"
        for numerator in range(1, denominator)
        if gcd(numerator, denominator) == 1
    ]


if __name__ == "__main__":
    from doctest import testmod

    testmod()

View on GitHub (pinned to f5988cc097)

Solutions

1. Pass a denominator greater than 0.

When it happens

Trigger: Thrown at maths/numerical_analysis/proper_fractions.py:27 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of TheAlgorithms/Python@f5988cc097 (2026-08-14). Data as JSON: /api/errors/310fa706d50fec0a. Report an issue: GitHub.