<｜begin▁of▁sentence｜>### Instruction:
As a lighting designer, you've been tasked with evaluating the effectiveness of the lighting layout for a new music concert venue by assessing the connections between different lighting fixtures. To determine this, you'll need to utilize the reciprocity function from the igraph library to calculate the overall proportion of mutual connections in the lighting network, while excluding any instances of individual lighting fixtures being connected to themselves. The directed graph data for the lighting network can be accessed from the directed_graph.gml file, which contains the pertinent layout information.
### Response:
from igraph import Graph

# Assume you have a directed graph in your GML file
g = Graph.Read_GML('directed_graph.gml')

# Calculate reciprocity of the graph
# We use mode='default' to calculate overall reciprocity
reciprocity_value = g.reciprocity(mode='default', ignore_loops=True)

# Print the calculated reciprocity value
print('Reciprocity of the graph:', reciprocity_value)
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