def attach(self, pwm_pin):
    if (self.pwm_pin):
      # Already attached to a pin, detach first
      self.detach()
    self.pwm_pin = pwm_pin

    pwmFrequency(self.pwm_pin, self.pwm_freq)
    self.period_ms = 1000.0/self.pwm_freq
Attach servo to PWM pin; alternative to passing PWM pin to
dataset/ETHPy150Open graycatlabs/PyBBIO/bbio/libraries/Servo/Servo.py/Servo.attach