Some source for the MBC and g-stops?

from time import sleep
import Adafruit_BBIO.GPIO as GPIO
import MotorBridge
#import numpy as np

LED  = "P8_28"
Stop = "P8_29"

GPIO.setup(LED, GPIO.OUT)
GPIO.setup(Stop, GPIO.IN)
motor     = MotorBridge.MotorBridgeCape()
MotorB    = motor.StepperMotorBInit()

#N = 0.00025
#h = np.array(N) # heights of family members (in meter)
#h[0] = 1.60; h[1] = 1.85; h[2] = 1.75; h[3] = 1.80; h[4] = 0.50

#sum = 0

#for i in [0, 1, 2, 3, 4]:
#    sum = sum + h[i]
#    average = sum/N
#    print('Average height: {:g} meter'.format(average))

try:
    while True:
        MotorB
        motor.StepperMotorBMove(-4500, 1000)
        sleep(5)
        motor.StepperMotorBMove(4500, 1000)
        sleep(5)
        if GPIO.wait_for_edge(Stop, GPIO.RISING):
            sleep(0.5)
            GPIO.output(LED, GPIO.LOW)
            sleep(2)
            GPIO.output(LED, GPIO.HIGH)
            sleep(4)
            GPIO.output(LED, GPIO.LOW)
            sleep(5)
            MotorB
            motor.StepperMotorBMove(0, 1000)
            sleep(10)
            motor.StepperMotorBMove(0, 1000)
            sleep(10)
        else:
            MotorB
            motor.StepperMotorBMove(2500, 1000)
            sleep(5)
            motor.StepperMotorBMove(-2500, 1000)
            sleep(5)

except KeyboardInterrupt:
    print('Hey!')