def classImpression(data, class_name, label_col = "Label"):
    """
    Return dataframe that contains only values of one class

    Parameters
    ----------
    data: numpy.dataFrame
        dataframe with data
    class_name: str, int, float
        name of class as its value (not necessarily a string)
    label_col: str (optional)
        name of label column

    Examples
    --------
    >>> d = classImpression(data_raw, 211, "Label_nr")

    Returns
    -------
    numpy.dataFrame
        dataframe containing all values of one class
    """
    d = data.loc[data[label_col] == class_name]
    d = d.drop(label_col, 1)
    return d