<｜begin▁of▁sentence｜>### Instruction:
Given a compressed graph file named 'compressed_graph.picklez' containing a pickled graph object, how many vertices does this graph contain?
### Response:
import igraph as ig

# Read the graph from compressed Python pickled format
g = ig.Graph.Read_Picklez('compressed_graph.picklez')

# Perform a basic operation, like counting the number of vertices
vertex_count = g.vcount()

# Print the number of vertices
print('Number of vertices in the graph:', vertex_count)
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