<｜begin▁of▁sentence｜>### Instruction:
Given the C. elegans neural network Graph which you can read from a gml file named celegansneural.gml, can you use the Louvain method in cdlib to perform community detection? And can you save the community structure to a comma-separated value (CSV) file?
### Response:
import networkx as nx
from cdlib import algorithms, readwrite

# Create a graph
G = nx.read_gml('celegansneural.gml')

# Detect communities using the Louvain method
communities = algorithms.louvain(G)

# Write communities to a CSV file
readwrite.write_community_csv(communities, 'communities.csv', ',')
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