On Thursday, December 14, 2017 at 9:57:25 AM UTC, Antonio Rojas wrote: > > Hi all, > In Arch we have upgraded networkx to version 2. This comes with major > API changes that affect Sage's interface, and I'm currently trying to fix > these issues. I'm struggling with a particular issue with bipartite > graphs. In pure ipython, this code gives: > > In [1]: import networkx > In [2]: A=networkx.complete_bipartite_graph(2,3) > In [3]: list(A.edges()) > Out[3]: [(0, 2), (0, 3), (0, 4), (1, 2), (1, 3), (1, 4)] > > The exact same code in Sage gives: > > sage: import networkx > sage: A=networkx.complete_bipartite_graph(2,3) > sage: list(A.edges()) > [(0, 0), (0, 1), (0, 2), (1, 1), (1, 2)] > > As you can see, Sage has shifted the second set of vertices to start at 0 > instead of 2, so of course this is not a bipartite graph anymore. This > seems strange since there is no Sage code involved in these commands at > first sight. > Can someone point me to the Sage code that modifies networkx's output so > I can look into it? > > Probably networkx calls some not so basic functionality of Python, which works differently in Sage. It seems that the only way to find out is to look at such places in networkx's code.
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