<｜begin▁of▁sentence｜>### Instruction:
Given a graph that has undergone some modifications (such as adding or removing edges) since its last modularity calculation, use the 'recalculate_modularity' function of 'VertexClustering' in igraph to update the modularity score of the graph clustering. Can you perform this recalculation and provide the new modularity value?
### Response:
from igraph import Graph
import igraph as ig

g = ig.Graph.Famous('Zachary')
vc = g.community_edge_betweenness()
clustering = vc.as_clustering()
print('Old modularity:', clustering.modularity)

# Modify the graph, for example, by deleting an edge
g.delete_edges(0)

# Recalculate the modularity after the graph modification
new_modularity = clustering.recalculate_modularity()
print('New modularity:', new_modularity)
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