def get_item_properties(item, fields, mixed_case_fields=(), formatters=None):
    """Return a tuple containing the item properties.

    :param item: a single item resource (e.g. Server, Tenant, etc)
    :param fields: tuple of strings with the desired field names
    :param mixed_case_fields: tuple of field names to preserve case
    :param formatters: dictionary mapping field names to callables
       to format the values
    """
    if formatters is None:
        formatters = {}
    row = []
    for field in fields:
        if field in formatters:
            row.append(formatters[field](item))
        else:
            field_name = field.replace(' ', '_')
            if not hasattr(item, field_name) and isinstance(item, dict):
                data = item[field_name]
            else:
                data = getattr(item, field_name, '')
            if data is None:
                data = ''
            row.append(data)
    return tuple(row)
