I wonder how many people here used or are using other Python scriptable microcontroller boards with Raspberry? Like PyMCU connectable via USB, or MicroPython, or even plain USB-UART dongles to script UART devices with pyserial (including SerIO board, or some pololu servo/robots boards etc.)? It seems like an easy way to extend GPIO capabilities of any single board computer that has USB.
I'm skipping Arduino or mbed as they are C/C++ (unless pymite is used). Do you know any other microcontroller board supporting Python?