add an empty function

Author: xiongyihui

keyboard/__init__.py

@@ -15,7 +15,7 @@
 from .hid import HID
 from .model import Matrix, COORDS, Backlight, battery_level
 from .action_code import *
-from .util import usb_is_connected
+from .util import usb_is_connected, do_nothing
 
 
 # fmt: off
@@ -84,9 +84,9 @@ def __init__(self, keymap=(), pairs=(), verbose=True):
         self.profiles = {}
         self.pairs = pairs
         self.verbose = verbose
-        self.pairs_handler = lambda dev, n: None
+        self.pairs_handler = do_nothing
         self.pair_keys = set()
-        self.macro_handler = lambda dev, key, pressed: None
+        self.macro_handler = do_nothing
         self.layer_mask = 1
         self.matrix = Matrix()
         self.backlight = Backlight()

keyboard/util.py

@@ -7,3 +7,7 @@ def mem(r0):
 
 def usb_is_connected():
     return mem(0x40000438) == 0x3
+
+
+def do_nothing(*args, **kargs):
+    pass