We cannot be certain of being right about the future; but we can be almost certain of being wrong about the future, if we are wrong about the past.

Gilbert Keith Chesterton, English writer, poet, philosopher, dramatist, journalist, orator, lay theologian, biographer, and literary and art critic

Appendix 2Migrating from NetworkX 1.x to 2.x

A new version of NetworkX—2.1—was released in January 2018, following the release of 2.0 in September 2017. The new stable version is only partially compatible with the old version 1.11. The book describes over one hundred NetworkX functions. Some of them have been affected by the transition.

Surely, the new version does not instantly make version 1.11 obsolete. 2.x will be gradually phased in, while 1.x ...

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