def get_mode_count(df):
    """
    Computes the mode and the count of the mode from an array.

    Args:
    df - data fram with ONE column

    Returns:
    df_mode - mode of the column
    df_mode_count - count for that mode

    """
    # calculate the mode and its count from the input data fram (with one column)
    df_value_counts = df.value_counts()
    df_mode = df_value_counts.index[0]
    df_mode_count = df_value_counts.iloc[0]

    return df_mode, df_mode_count