<｜begin▁of▁sentence｜>### Instruction:
Given a graph with 3 vertices named 'A', 'B', and 'C', each with a color attribute set to 'red', 'green', and 'blue' respectively, how do you retrieve the list of vertex attribute names using the `VertexSeq.VertexSeq.attribute_names` method in igraph?
### Response:
import igraph as ig

# Create a simple graph with 3 vertices and vertex attributes
g = ig.Graph(n=3)
g.vs['name'] = ['A', 'B', 'C']
g.vs['color'] = ['red', 'green', 'blue']

# Use attribute_names to get the list of vertex attribute names
attribute_names = g.vs.attribute_names()

# Print the list of attribute names
print(attribute_names)
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