import time
from machine import Pin
time.sleep(0.1) # Wait for USB to become ready

BTN_PIN = 16

button = Pin(BTN_PIN, Pin.IN, Pin.PULL_UP)

#==== code below ===============

# button is a variable that represents the button 

# when the button is pressed print "Hello World!"
# make this happen within a function

while True:

    time.sleep(0.3)