networkx

Load the network into networkx for your own analysis, or save it to a file. Needs pip install "duckosm[routing]".

Function	Nodes	Edges
to_networkx(con)	edges (edge_id), with name, highway, length_m, maxspeed_kmh, cost_s, geometry (WKT)	legal turns; weight is the time of the edge you leave (weight="length": its metres)
to_networkx_nodes(con)	junctions (x, y = lon, lat)	roads, keyed by edge_id, with every column (osmnx layout, but the length is length_m, not length)

Both take mode= too.

To save either one to a file (the format comes from the extension):

duckosm export-graph monaco.duckdb                            # -> monaco_driving.graphml (junctions)
duckosm export-graph monaco.duckdb -g edge -o routing.gpickle # the routing graph

GraphML opens in any tool but stores lists and geometry as text; gpickle keeps lists and types but only loads in Python (add --geometry shapely for shapely geometries on the junction graph). From Python: write_graph(con, "monaco.graphml").

Turns of the restricted edges

The edge graph has only the mode's own turns. To add the turns into and out of the restricted edges (private_edges: bus, private, pedestrian, delivery), give uses:

G = to_networkx(con, "driving", uses="pedestrian,private")   # CLI: duckosm export-graph --graph edge --uses pedestrian,private
G.nodes[edge_id]["access"]                                    # 'pedestrian' on a restricted edge; absent on a usable edge

A restricted edge is a node with its cost_s as the weight of its arcs. Do not route cars over them: use this to look at what meets at a junction. Database reference.