<｜begin▁of▁sentence｜>### Instruction:
Given a graph with edges [(0, 1), (1, 2), (0, 2), (2, 3), (3, 4)] and a vertex attribute 'category' with values ['A', 'A', 'B', 'B', 'A'], can you use the 'assortativity_nominal' function in igraph to calculate the assortativity based on the 'category' attribute?
### Response:
import igraph as ig

# Create a new graph with the given edges and assign categories as vertex attributes
g = ig.Graph(edges=[(0, 1), (1, 2), (0, 2), (2, 3), (3, 4)])
g.vs['category'] = ['A', 'A', 'B', 'B', 'A']

# Calculate the assortativity based on the 'category' vertex attribute
assortativity = g.assortativity_nominal('category')

# Print the assortativity
print('Assortativity based on vertex categories:', assortativity)
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