Don't forgot to install dependencies for python3 with :
sudo pip3 install RPi.GPIO smbus-cffi Adafruit-GPIO Adafruit-MotorHAT
If you can't import module named 'Adafruit_PWM_Servo_Driver', just copy all files in Adafruit_MotorHAT folder in your current folder.
Python library for interfacing with the Adafruit Motor HAT for Raspberry Pi to control DC motors with speed control and Stepper motors with single, double, interleave and microstepping.
Designed specifically to work with the Adafruit Motor Hat
----> https://www.adafruit.com/product/2348
Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Written by Limor Fried for Adafruit Industries. MIT license, all text above must be included in any redistribution