#!/usr/bin/env python3

import os
import rdflib

dir="graph"
g = rdflib.Graph()

files = os.listdir(dir)

for file in files:

    try:
        cg = rdflib.Graph()
        file = dir + "/" + file
        cg.parse(file, format="turtle")

        for t in cg:
            g.add(t)
    except Exception as e:
        print(f"{file}: {str(e)}")

g.serialize(destination="graph.ttl")