This MicroPython library provides a framework for interacting with HD44780-based LCD displays through a PCF8574 I/O expander. It offers a high-level API for LCD control, including text display, cursor manipulation, and backlight settings, while also providing lower-level access to the GPIO operations on the PCF8574.
The explanation in this README does not show much, unless the backlight is set on after the lcd has been instanciated.