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# Source code for astropy.units.errors

    # Licensed under a 3-clause BSD style license - see LICENSE.rst

    """Custom errors and exceptions for astropy.units."""

    __all__ = [
        "UnitConversionError",
        "UnitParserWarning",
        "UnitScaleError",
        "UnitTypeError",
        "UnitsError",
        "UnitsWarning",
    ]

    from astropy.utils.exceptions import AstropyWarning

    class UnitsError(Exception):
        """
        The base class for unit-specific exceptions.
        """

    class UnitConversionError(UnitsError, ValueError):
        """
        Used specifically for errors related to converting between units or
        interpreting units in terms of other units.
        """

    class UnitScaleError(UnitsError, ValueError):
        """
        Used to catch the errors involving scaled units,
        which are not recognized by FITS format.
        """

    class UnitTypeError(UnitsError, TypeError):
        """
        Used specifically for errors in setting to units not allowed by a class.

        E.g., would be raised if the unit of an `~astropy.coordinates.Angle`
        instances were set to a non-angular unit.
        """

    class UnitsWarning(AstropyWarning):
        """
        The base class for unit-specific warnings.
        """

    class UnitParserWarning(UnitsWarning):
        """Unit parser warnings"""