First Graph with ipycytoscape

data1.py

railnet= '''{
    "nodes": [
        {"data": { "id": "BER" }},
        {"data": { "id": "MUN"}},
        {"data": { "id": "FRA"}},
        {"data": { "id": "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_obj = ipycytoscape.CytoscapeWidget()
  ipycytoscape_obj.graph.add_graph_from_json(railnetJSON)
  ipycytoscape_obj