Python library interfacing LED matrix displays with the MAX7219 driver (using SPI) and WS2812 & APA102 NeoPixels (inc Pimoroni Unicorn pHat/Hat and Unicorn Hat HD) on the Raspberry Pi and other Linux-based single board computers - it provides a Pillow-compatible drawing canvas, and other functionality to support:
multiple cascaded devices
LED matrix, seven-segment and NeoPixel variants
dithering to monochrome,
Python 3.6+ is supported
A LED matrix can be acquired for a few pounds from outlets like Banggood. Likewise 7-segment displays are available from Ali-Express or Ebay.