Building a Python wrapper of C libgeohash using CFFI

First post for DEV.TO 🎊️

I didn't know what a Geohash is before and was blown away by it's concept. I found an implementation of it written in C. Well I always have been wanting to experiment with foreign functions and found CFFI suitable for my case. On that same afternoon I wrote a simple wrapper of libgeohash in Python.

Check this out! https://aldnav.com/blog/writing-a-geohash-wrapper-using-cffi/
What's that? Want to jump in to the source code instead? Ok! https://github.com/aldnav/geohash

Here's a preview.

# geohash_build.py from cffi import FFI ffi = FFI() ffi.cdef( """ char* geohash_encode(double lat, double lng, int precision); GeoCoord geohash_decode(char* hash); """ ) lib = ffi.dlopen("geohash.so") ffi.set_source("_geohash", None) 

# Simple testing from _geohash import ffi, lib print(lib.geohash_encode(35.689487, 139.691706, 6)) #>> xn774c 

# Use geohash module import geohash geohash.geohash_encode(48.856614, 2.352222) # u09tvw for Paris! geohash.geohash_decode("wy7b1h") # lat: 35.179554, long: 129.075642 

Check my notes to see how I build the wrapper. Plus some more references that links to more comprehensive notes from the respective authors.

Let me know your thoughts!