You must enable SPI on your Raspberry Pi:

• Run: sudo raspi-config nonint do_spi 0

Stable library from PyPi:

• Just run sudo pip3 install unicornhatmini

Or for Python 2:

• sudo pip install unicornhatmini

Latest/development library from GitHub:

• git clone https://github.com/pimoroni/unicornhatmini-python
• cd unicornhatmini-python
• sudo ./install.sh