from tm1637 import TM1637
import time

SDA = 4
MY1637_COLMNS = 4
CONTRAST = 3

tm = TM1637(SDA, MY1637_COLMNS, CONTRAST)
tm.show_str("12:34")
time.sleep(5)
tm.show_str("5555")
time.sleep(5)
i = 0
while(True):
    tm.show_str('%4d' % i)
    i += 1
    if i > 9999:
        i = 0
    time.sleep(1)