import os
os.getcwd()
f = open('main.py', 'rw+')
print(f.read())
f.write('import time\n')
f.write('from machine import Pin\n')
f.write('led1 = Pin(Pin.cpu.P106)\n')
f.write('while True:\n')
f.write('    led1.on()\n')
f.write('    time.sleep(1)\n')
f.write('    led1.off()\n')
f.write('    time.sleep(1)\n')
f.close()
f = open('main.py', 'r')
print(f.read())
f.close()