Error in datastructure in sagemath

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Once you create the graph:

sage: g = graphs.CompleteGraph(5)
sage: g
Complete graph: Graph on 5 vertices

This is what happens if you provide wrong input:

sage: g.to_directed('wrong input')
Traceback (most recent call last)
...
ValueError: data_structure must be equal to 'sparse', 'static_sparse' or 'dense'

Following what the documentation of the method to_directed for undirected graphs says, you may instead write:

sage: g.to_directed('dense')
Complete graph: Digraph on 5 vertices

You may also create a directed graph directly using DiGraph (various different type of inputs), see the documentation.

duplicate of https://ask.sagemath.org/question/502...