def _create_parameter_key(parameter_combination):
    """
    Create key value for parameter combination.

    Parameters
    ----------
    parameter_combination : dict
        One parameter combination used for calculation.

    Returns
    -------
    str
        Key value for that combination
    """
    temp_list = []
    for key, value in sorted(parameter_combination.items(), key=lambda x: str(x[0])):
        temp_list.append(str(key) + "=" + str(value))
    return ", ".join(temp_list)