In [1]: from igraph import Graph
In [2]: g = Graph(1)
In [5]: g.add_vertices(2)
In [7]: g.add_edges([(0,1), (1,2)])
In [8]: print(g)
IGRAPH U--- 3 2 --
+ edges:
0--1 1--2
In [9]: g.write_pajek('test')
In [11]: g.write_graphml('test')
In [12]: g.write('test.net')
In [13]: g.write('test.net', format='net')
In [14]: g.write('test.net', format='pickle')
In [15]: g.save('test.net')
In [16]: f = open('test.net', 'w')
In [17]: g.write_pajek(f)
All of these produce empty files, instead of something with information on
the graph g. What am I doing wrong?
Thanks!
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