def is_none(value):
    """Checks if `value` is `None`.

    Args:
        value (mixed): Value to check.

    Returns:
        bool: Whether `value` is ``None``.

    Example:

        >>> is_none(None)
        True
        >>> is_none(False)
        False

    .. versionadded:: 1.0.0
    """
    return value is None
