beginner.seeed.cc
(Grove beginner kit documentation)
Arduino (home)
Programming Arduino Using Python
Arduino with Python LESSON 1: Introduction to using Python with Arduino (YouTube)
Python + Arduino UNO with pyFirmata (YouTube)
The Arduino connects to a USB port. You must set the USB port to read/write. The default is read only.
sudo chmod a+rw /dev/ttyUSB0