all: Format with black.

Also activate auto formatting. Bump flake8 and mark black
disagreements in setup.cfg.

examples/ev3/ev3devsensor/class_example.py

@@ -13,22 +13,22 @@ class MySensor(Ev3devSensor):
         super().__init__(port)
 
         # Get the sysfs path.
-        self.path = '/sys/class/lego-sensor/sensor' + str(self.sensor_index)
+        self.path = "/sys/class/lego-sensor/sensor" + str(self.sensor_index)
 
     def get_modes(self):
         """Get a list of mode strings so we don't have to look them up."""
 
         # The path of the modes file.
-        modes_path = self.path + '/modes'
+        modes_path = self.path + "/modes"
 
         # Open the modes file.
-        with open(modes_path, 'r') as m:
+        with open(modes_path, "r") as m:
 
             # Read the contents.
             contents = m.read()
 
             # Strip the newline symbol, and split at every space symbol.
-            return contents.strip().split(' ')
+            return contents.strip().split(" ")
 
 
 # Initialize the sensor

examples/ev3/ev3devsensor/main.py

@@ -10,10 +10,10 @@ sensor = Ev3devSensor(Port.S3)
 
 while True:
     # Read the raw RGB values
-    r, g, b = sensor.read('RGB-RAW')
+    r, g, b = sensor.read("RGB-RAW")
 
     # Print results
-    print('R: {0}\t G: {1}\t B: {2}'.format(r, g, b))
+    print("R: {0}\t G: {1}\t B: {2}".format(r, g, b))
 
     # Wait
     wait(200)