adding names

gistfile1.py

railnet= '''{
    "nodes": [
        {"data": { "id": "BER", "label":"HBf BER"}},
        {"data": { "id": "MUN", "label":"HBf MUN"}},
        {"data": { "id": "FRA", "label":"HBf FRA"}},
        {"data": { "id": "HAM", "label":"HBf HAM"}}
        ],
    "edges": [
        {"data": { "source": "BER", "target": "MUN" }},
        {"data": { "source": "MUN", "target": "FRA" }},
        {"data": { "source": "FRA", "target": "BER" }},
        {"data": { "source": "BER", "target": "HAM" }}
        
    ]
  }'''

railnetJSON = json.loads(railnet)
ipycytoscape_obj4 = ipycytoscape.CytoscapeWidget()
ipycytoscape_obj4.graph.add_graph_from_json(railnetJSON, directed=False) 
ipycytoscape_obj4