from machine import pin
import time 
a=Pin(0,Pin.OUT)
b=Pin(1,Pin.OUT)
c=Pin(2,Pin.OUT)
d=Pin(3,Pin.OUT)
e=Pin(4,Pin.OUT)
f=Pin(5,Pin.OUT)
g=Pin(6,Pin.OUT)
while True:
  a.on()
  b.off()
  c.off()
  d.off()
  e.off()
  f.off()
  g.off()