def get_most_common_value(data_frame, field):
    """Calculates the most common value (mode) of a field in a given DataFrame.

    Args:
        data_frame (DataFrame):  the Pandas DataFrame to analyze
        field (string): the field to calculate the modal from

    Returns:
        Series: the most common value of the field
    """
    return data_frame[field].mode()[0]
    # ------------------------------------------------ get_most_common_value()