greatrfet_nrf is a Python library used to control an nRF24 chip with GreatFET. The library supports using the nRF to perform promiscuous sniffing via the method discovered by Travis Goodspeed and shared in his blog post here
A lot of the code in this library was ported from or influenced by the goodfet and the RadioHead NRF24 projects.
Check out init_radio, autotune, find_channel, and record_packets for quick ways to interface with this library.