Ch-5 clean

ch-5/5-path/pwm_drive_square.py

@@ -1,20 +1,22 @@
 import time
 import robot
 
+
 def straight(speed, duration):
     robot.set_left(speed)
     robot.set_right(speed)
     time.sleep(duration)
 
+
 def left(speed, duration):
     robot.set_left(0)
     robot.set_right(speed)
     time.sleep(duration)
 
+
 try:
     for n in range(0, 4):
         straight(0.6, 1.0)
         left(0.6, 1)
 finally:
     robot.stop()
-

ch-5/5-path/robot.py

@@ -8,7 +8,7 @@ motor_B2 = pwmio.PWMOut(board.GP19)
 
 right_motor = motor_A1, motor_A2
 left_motor = motor_B1, motor_B2
-max_speed = 2**16-1
+max_speed = 2 ** 16 - 1
 
 
 def stop():
@@ -25,7 +25,7 @@ def set_speed(motor, speed):
         speed = -speed
     else:
         direction = motor
-    speed = min(speed, 1) # limit to 1.0
+    speed = min(speed, 1)  # limit to 1.0
 
     direction[0].duty_cycle = int(max_speed * speed)
     direction[1].duty_cycle = 0