diff --git a/bcf2000.py b/bcf2000.py
--- a/bcf2000.py
+++ b/bcf2000.py
@@ -6,11 +6,12 @@ from twisted.internet import reactor
 from twisted.internet.task import LoopingCall
 from typing import Dict
 
+
 class BCF2000(object):
 
     control = {81 : "slider1", 82 : "slider2", 83 : "slider3", 84 : "slider4",
                85 : "slider5", 86 : "slider6", 87 : "slider7", 88 : "slider8",
-
+ 
                 1 : "knob1",  2 : "knob2",  3 : "knob3",  4 : "knob4",
                 5 : "knob5",  6 : "knob6",  7 : "knob7",  8 : "knob8",
 
@@ -36,7 +37,7 @@ class BCF2000(object):
         once as C0D0. It should be autodetected"""
         self.devPath = dev
         self.dev = None
-        self.lastValue: Dict[str, int] = {} # control name : value
+        self.lastValue: Dict[str, int] = {}  # control name : value
         self.reopen()
         self.packet = b""
         loop = LoopingCall(self.poll)
@@ -78,18 +79,18 @@ class BCF2000(object):
         self.lastValue.clear()
         self.dev = open(self.devPath, "rb+", buffering=0)
         twisted.internet.fdesc.setNonBlocking(self.dev)
-                    
+
     def valueIn(self, name, value):
         """override this with your handler for when events come in
         from the hardware"""
         print("slider %s to %s" % (name, value))
         if name == 'slider1':
-            for x in range(2,8+1):
+            for x in range(2, 8 + 1):
                 v2 = int(64 + 64 * math.sin(x / 3 + value / 10))
                 self.valueOut('slider%d' % x, v2)
-            for x in range(1,8+1):
-                self.valueOut('button-upper%s' % x, value > x*15)
-                self.valueOut('button-lower%s' % x, value > (x*15+7))
+            for x in range(1, 8 + 1):
+                self.valueOut('button-upper%s' % x, value > x * 15)
+                self.valueOut('button-lower%s' % x, value > (x * 15 + 7))
 
     def valueOut(self, name, value):
         """call this to send an event to the hardware"""
@@ -100,7 +101,7 @@ class BCF2000(object):
         if self.lastValue.get(name) == value:
             return
         self.lastValue[name] = value
-        which = [k for k,v in list(self.control.items()) if v == name]
+        which = [k for k, v in list(self.control.items()) if v == name]
         assert len(which) == 1, "unknown control name %r" % name
         if name.startswith('button-'):
             value = value * 127
@@ -111,6 +112,7 @@ class BCF2000(object):
         self.dev.close()
         self.dev = None
 
+
 if __name__ == '__main__':
     b = BCF2000()
     reactor.run()