import six


def to_strkey_dict(dictionary):
    """
    Convert a unicode key dict into str key dict

    :type  dictionary: :class:`dict`
    :param dictionary: unicode dictionary
    :rtype: :class:`dict`
    :return: string key dict
    """
    result = {}
    for key, val in six.iteritems(dictionary):
        result[str(key)] = val
    return result