def blood_group():
    if not os.path.exists('analytics'):
        os.mkdir('analytics')
    if os.path.exists('analytics/blood_group'):
        shutil.rmtree('analytics/blood_group')
    with open('studentinfo_cs384.csv', newline='') as csvfile:
        reader = csv.DictReader(csvfile)
        if not os.path.exists('analytics/blood_group'):
            os.mkdir('analytics/blood_group')
        for row in reader:
            l = list(row.values())
            head = list(row.keys())
            with open('analytics/blood_group/'+row['blood_group']+ '.csv', mode = 'a') as f:
                f_write = csv.writer(f, delimiter=',',lineterminator='\r')
                if os.path.getsize('analytics/blood_group/'+row['blood_group'] + '.csv')==0:
                    f_write.writerow(head) 
                f_write.writerow(l)
            f.close()
    csvfile.close()


# Create the new file here and also sort it in this function only.