Each unionFind instance X maintains a family of disjoint sets of hashable objects, supporting the following two methods:
X[item] returns a name for the set containing the given item. Each set is named by an arbitrarily-chosen one of its members; as long as the set remains unchanged it will keep the same name. If the item is not yet part of a set in X, a new singleton set is created for it.
X.union(item1, item2, ...) merges the sets containing each item into a single larger set. If any item is not yet part of a set in X, it is added to X as one of the members of the merged set.
Union-find data structure. Based on Josiah Carlson's code, https://code.activestate.com/recipes/215912/ with significant additional changes by D. Eppstein. http://www.ics.uci.edu/~eppstein/PADS/UnionFind.py
Union-find data structure.
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All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them
