#
# for my son
# write by kyoung chip , jang
#
def test_db() :
    yield "0x01" , 100 , 210
    yield "0x02" , 300 , 220
    yield "0x03" , 400 , 230

def write_csv( csvfile ) :
    print(" csvfile = %s " % csvfile )
    w = ['data1,data2,data3']
    with open(csvfile, 'w') as f:
        c = 0
        for data1, data2, data3 in test_db():

            print("data1 = %s " % data1 )
            w.append(
                data1 + ',' + str(data2) + ',' + str(data3)
            )
            c += 1
            if c == 1000:
                f.write('\n'.join(w) + '\n')
                w = []
                c = 0
        if c > 0:
            f.write('\n'.join(w) + '\n')
        f.write('\n')
    print('writen to %s' % csvfile)


if __name__ == '__main__':
    write_csv('./test.csv')