offline reverse GIS geocoder in Python

I need a program to offline reverse Geocode in Python Ideally, a QGIS geocode Python script written and delivered (with source code) that will convert United States geological points... Longitude and Latitude… to the nearest USA City. The logic of this program will internally load a geocodes reference file (that I will provide) to decode the LONG/LAT to a valid nearest USA City, entirely offline (not using any form online query or API's). My research on this task has lead me to this following article that describes exactly how I need the script to perform: “A fast, offline reverse geocoder in Python”: [login to view URL] I have installed QGIS on my Windows PC to support this script. I have a USA file (that I will provide) of all cities in the United State with a LONG/LAT for each of these cities, that can be used as the reference file in this script. As an example:: if I have a USA longitude/latitude of --119.2903981 and 35.5089874, then the offline script should report the city of Shater, CA. if I have a USA longitude/latitude of -117.6677781 and 35.640557, then the offline script should report the city of Ridgecrest, CA. if I have a USA longitude/latitude of Longitude/Latitude of -120.1748824 and 35.6204433, then the offline script should return Shandon, CA as the closest city to these LONG/LAT coordinates. I have CSV text input files (a sample file attached)that contains the Longitude/Latitude geocode coordinates that need to be reverse geocoded. The program will process all files: read CSV file rows’ decode for the Long/Lat to the nearest city and write that city as an additional field to all output files. I have installed QGIS, if needed, to support this program