python – How to use an interpolation method to extract data from a grib2 file at a specific latitude/longitude point

I am new to using grib2 files and I am wondering how you can interpolate a grib2 file (using pygrib) and extract data (precipitation, in my case) at a specific latitude/longitude point, so the output file (in text format) includes the precipitation value at that point? Any suggestions are appreciated, thank you!