def find_missing_value(var):
    """
    Get the missing / fill value of the variable

    :param var: NetCDF Variable instance
    :return: missing / fill value
    """
    try:
        missing_value = var.missing_value
    except AttributeError:
        try:
            missing_value = var._FillValue
        except AttributeError:
            missing_value = None
    return missing_value
