#17156: Creating a graph from a immutable digraph raises an error
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Reporter: tscrim | Owner: tscrim
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: graph theory | Keywords: immutable graph
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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We currently have the following:
{{{
sage: D = DiGraph([[1, 2]], immutable=True)
sage: Graph(D)
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
...
NotImplementedError: An immutable graph does not change name
}}}
For the record, this works
{{{
sage: D = DiGraph([[1, 2]])
sage: Graph(D)
Graph on 2 vertices
}}}
I'm also wondering about the error type of (attempted) mutations of
immutable (di)graphs. Some raise a `ValueError`, others raise a
`NotImplementedError`. This needs to be made consistent at some point.
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Ticket URL: <http://trac.sagemath.org/ticket/17156>
Sage <http://www.sagemath.org>
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