<｜begin▁of▁sentence｜>### Instruction:
Given a complete graph with 3 vertices, can you use the CohesiveBlocks.cohesion method in igraph to get the cohesion of the first block? You need to print the cohesion of the first block.
### Response:
from igraph import Graph

# Create or read a graph
g = Graph.Full(3)
# Calculate the cohesive blocks of the graph
cohesive_blocks = g.cohesive_blocks()

# Get the cohesion of the first block
cohesion_first_block = cohesive_blocks.cohesion(0)
print('Cohesion of the first block:', cohesion_first_block)
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