<｜begin▁of▁sentence｜>### Instruction:
Given a directed graph with edge list [(0, 1), (1, 2), (2, 3)], use the networkx dyad_census function to calculate the dyad census. Then, retrieve the count of mutual dyads using __getattr__ and print the result.
### Response:
import networkx as nx

# Create a directed graph
g = nx.DiGraph()
g.add_edges_from([(0, 1), (1, 2), (2, 3)])

# Calculate dyad census for the graph
dyad_census = nx.algorithms.structuralholes.dyad_census(g)

# Accessing the count of mutual dyads through __getattr__
mutual_count = dyad_census.__getattr__('mutual')
print(mutual_count)
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