Update btns.py

btns.py

 import RPi.GPIO as GPIO # Import Raspberry Pi GPIO library
 
 
-  try:
-    GPIO.setwarnings(False) # Ignore warning for now
-    GPIO.setmode(GPIO.BOARD) # Use physical pin numbering
-    GPIO.setup(13, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 22 to be an input pin and set initial value to be pulled low (off)
-    GPIO.setup(15, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 23 to be an input pin and set initial value to be pulled low (off)
-    GPIO.setup(16, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 24 to be an input pin and set initial value to be pulled low (off)
-    GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 26 to be an input pin and set initial value to be pulled low (off)
-    while True: # Run forever
-        if GPIO.input(13) == GPIO.HIGH:
-            print("no")
-            break
-        if GPIO.input(15) == GPIO.HIGH:
-            print("down")
-            break
-        if GPIO.input(16) == GPIO.HIGH:
-            print("up")
-            break
-        if GPIO.input(18) == GPIO.HIGH:
-            print("yes")
-            break
-  finally:
-    print("pressed")  
-    GPIO.cleanup()
+try:
+  GPIO.setwarnings(False) # Ignore warning for now
+  GPIO.setmode(GPIO.BOARD) # Use physical pin numbering
+  GPIO.setup(13, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 22 to be an input pin and set initial value to be pulled low (off)
+  GPIO.setup(15, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 23 to be an input pin and set initial value to be pulled low (off)
+  GPIO.setup(16, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 24 to be an input pin and set initial value to be pulled low (off)
+  GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # Set pin 26 to be an input pin and set initial value to be pulled low (off)
+  while True: # Run forever
+      if GPIO.input(13) == GPIO.HIGH:
+          print("no")
+          break
+      if GPIO.input(15) == GPIO.HIGH:
+          print("down")
+          break
+      if GPIO.input(16) == GPIO.HIGH:
+          print("up")
+          break
+      if GPIO.input(18) == GPIO.HIGH:
+          print("yes")
+          break
+finally:
+  print("pressed")  
+  GPIO.cleanup()