def _validate_timeout(cls, value: _TYPE_TIMEOUT, name: str) -> _TYPE_TIMEOUT:
        """Check that a timeout attribute is valid.

        :param value: The timeout value to validate
        :param name: The name of the timeout attribute to validate. This is
            used to specify in error messages.
        :return: The validated and casted version of the given value.
        :raises ValueError: If it is a numeric value less than or equal to
            zero, or the type is not an integer, float, or None.
        """
        if value is None or value is _DEFAULT_TIMEOUT:
            return value

        if isinstance(value, bool):
            raise ValueError(
                "Timeout cannot be a boolean value. It must "
                "be an int, float or None."
            )
        try:
            float(value)
        except (TypeError, ValueError):
            raise ValueError(
                "Timeout value %s was %s, but it must be an "
                "int, float or None." % (name, value)
            ) from None

        try:
            if value <= 0:
                raise ValueError(
                    "Attempted to set %s timeout to %s, but the "
                    "timeout cannot be set to a value less "
                    "than or equal to 0." % (name, value)
                )
        except TypeError:
            raise ValueError(
                "Timeout value %s was %s, but it must be an "
                "int, float or None." % (name, value)
            ) from None

        return value
Check that a timeout attribute is valid.

        :param value: The timeout value to validate
        :param name: The name of the timeout attribute to validate. This is
            used to specify in error messages.
        :return: The validated and casted version of the given value.
        :raises ValueError: If it is a numeric value less than or equal to
            zero, or the type is not an integer, float, or None.
        
src/urllib3/util/timeout.py