def course():
    if not os.path.exists('analytics'):
        os.mkdir('analytics')
    if os.path.exists('analytics/course'):
        shutil.rmtree('analytics/course')
    d = {'01':'btech',
    '11':'mtech',
    '21':'phd',
    '12':'msc'}
    with open('studentinfo_cs384.csv', newline='') as csvfile:
        reader = csv.DictReader(csvfile)
        if not os.path.exists('analytics/course'):
            os.mkdir('analytics/course')
        for row in reader:
            if len(row)==0:
                print(1)
                continue
            l = list(row.values())
            head = list(row.keys())
            stream = str(row['id'][-4:-2]).lower()
            yr = str(row['id'][:2])
            if str(row['id'][2:4]) in list(d.keys()):
                degree = d[str(row['id'][2:4])]
            else:
                with open('analytics/course/' + 'misc.csv' , mode = 'a') as f:
                    f_write = csv.writer(f, delimiter=',',lineterminator='\r')
                    if os.path.getsize('analytics/course/' + 'misc.csv')==0:
                        f_write.writerow(head)
                    f_write.writerow(l)
                f.close()
                continue
            csv_name = f'{yr}_{stream}_{degree}.csv'
            p = re.compile(r'\d\d\d\d\D\D\d\d')
            k = re.fullmatch(p,row['id'])
            if k:
                if not os.path.exists('analytics/course/'+ stream):
                    os.mkdir('analytics/course/'+ stream) 
                if not os.path.exists('analytics/course/'+ stream + '/' + degree):
                    os.mkdir('analytics/course/'+ stream + '/' + degree ) 
                with open('analytics/course/'+ stream + '/' + degree + '/' + csv_name , mode = 'a') as f:
                    f_write = csv.writer(f, delimiter=',',lineterminator='\r')
                    if os.path.getsize('analytics/course/'+ stream + '/' + degree + '/' + csv_name)==0:
                        f_write.writerow(head)
                    f_write.writerow(l)
                f.close()
            else:
                with open('analytics/course/' + 'misc.csv' , mode = 'a') as f:
                    f_write = csv.writer(f, delimiter=',',lineterminator='\r')
                    if os.path.getsize('analytics/course/' + 'misc.csv')==0:
                        f_write.writerow(head)
                    f_write.writerow(l)
                f.close()
    csvfile.close()