<｜begin▁of▁sentence｜>### Instruction:
Assuming you're working with a network visualization tool like Gephi and you have a NetworkX graph already created and ready to stream, how would you generate a JSON event to change the attributes of a node within that graph to update the visualization in Gephi, and how can you specify the new attributes or remove existing ones?
### Response:
from networkx.readwrite.json_graph import node_link_data
import json

# Assuming we have a NetworkX graph
G = nx.Graph()
G.add_node(1, label='Node1', weight=10)
G.add_node(2, label='Node2', weight=20)
G.add_edge(1, 2)

# GephiGraphStreamingAPIFormat.get_change_node_event
# Let's change the weight of node 1 to 15 and remove the label
change_event = GephiGraphStreamingAPIFormat.get_change_node_event(1, {'weight': 15, 'label': None})

# Convert the change_event to JSON format
change_event_json = json.dumps(change_event)
print(change_event_json)
<|EOT|>
