Read and write graphs.

Read and write graphs.

(0, 0) (1, 0) (0, 1)
(0, 1) (1, 1) (0, 2)
(0, 2) (1, 2) (0, 3)
(0, 3) (1, 3) (0, 4)
(0, 4) (1, 4)
(1, 0) (2, 0) (1, 1)
(1, 1) (2, 1) (1, 2)
(1, 2) (2, 2) (1, 3)
(1, 3) (2, 3) (1, 4)
(1, 4) (2, 4)
(2, 0) (3, 0) (2, 1)
(2, 1) (3, 1) (2, 2)
(2, 2) (3, 2) (2, 3)
(2, 3) (3, 3) (2, 4)
(2, 4) (3, 4)
(3, 0) (4, 0) (3, 1)
(3, 1) (4, 1) (3, 2)
(3, 2) (4, 2) (3, 3)
(3, 3) (4, 3) (3, 4)
(3, 4) (4, 4)
(4, 0) (4, 1)
(4, 1) (4, 2)
(4, 2) (4, 3)
(4, 3) (4, 4)
(4, 4)

import matplotlib.pyplot as plt
import networkx as nx

G = nx.grid_2d_graph(5, 5)  # 5x5 grid

# print the adjacency list
for line in nx.generate_adjlist(G):
    print(line)
# write edgelist to grid.edgelist
nx.write_edgelist(G, path="grid.edgelist", delimiter=":")
# read edgelist from grid.edgelist
H = nx.read_edgelist(path="grid.edgelist", delimiter=":")

pos = nx.spring_layout(H, seed=200)
nx.draw(H, pos)
plt.show()