<｜begin▁of▁sentence｜>### Instruction:
Assuming there is a command-line utility provided by igraph which can be triggered using igraph.main(), can you simulate this functionality in a Python script that creates a simple cycle graph with 4 nodes, plots the graph, and then invokes this main function?
### Response:
import igraph

# This example assumes that igraph's main function is being called from the command line
# It creates a basic graph with some nodes and edges, plots it, and then invokes the main function

# Create a graph with nodes and edges
g = igraph.Graph(edges=[(0, 1), (1, 2), (2, 3), (3, 0)])

# Plot the graph (will save the image or show a window depending on your environment)
igraph.plot(g, 'mygraph.png')

# Normally, the main function would be invoked from the command line
# Here, it's being simulated as a function call (which might not be the intended use)
igraph.main()
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