I am editing OSM data to add the bridge information. To do so, I have downloaded OSM data in my local machine as a geopackage file and planning to use python for this. To do this, i have below information:

I am new to OSM and am tryng to leverage it to calculate the total length of pedestrian walkways (i.e., footways and sidewalks) within individual cities. I am using OSM wiki to determine which keys I should be using to account for all type of paths (https://wiki.openstreetmap.org/wiki/Key:highway). My focus is on footways and sidewalks.