1. For OLED display I use driver ssd1306 and put ssd1306 pyhon file on my board. For example:

ampy -p COM3 put ssd1306.py

2. Function let_it_snow is drawing one snowflake. Put let_it_snow.py on your board:

ampy -p COM3 put let_it_snow.py

3. Snowflakes should appear in random places on the display, we need random lib! Download it and put it on your board:

ampy -p COM3 put random.py

4. Please see an example py for example usage. Put example python file on your board or just run:

ampy -p COM3 run example.py

* COM3 is the serial port on my computer. COM port on your computer may be different.