#15603: "immutable=True" for Graph/Digraph __init__ and copy()
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.1
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers:
theory | Work issues:
Keywords: | Commit:
Authors: | 7860f3997ae9ecd954f0696025fbb63e0219e78b
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/15603 |
Dependencies: |
#15278 |
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Comment (by SimonKing):
{{{
sage: g = graphs.PetersenGraph()
sage: g = DiGraph(g.edges(),immutable=False)
sage: g.add_edge("Hey", "Heyyyyyyy")
sage: {g:1}[g]
TypeError: This graph is mutable, and thus not hashable.
Create an immutable copy by `g.copy(data_structure='static_sparse')`
}}}
Should the error message mention the other (more intuitive) possibility
`g.copy(immutable=True)`?
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Ticket URL: <http://trac.sagemath.org/ticket/15603#comment:15>
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