from machine import Pin
import time

boton = Pin(7,  Pin.IN)
led   = Pin(25, Pin.OUT)

while True:
    if boton.value() == 1:
        led.value(1)
        print("ON")
    if boton.value() == 0:
        led.value(0)
        print('OFF')



# solución #2
"""
from machine import Pin
import time

led   = Pin(25, Pin.OUT)

while True:
    if Pin(7, Pin.IN).value() == 1:
        led.value(1)
        print("ON")
    if Pin(7, Pin.IN).value() == 0:
        led.value(0)
        print('OFF')
"""