#19622: Automatic error message when packages are not installed
----------------------------------+-------------------------
Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-6.10
Component: user interface | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> How to install `bliss`?
>
> {{{
> sage: G = graphs.PetersenGraph()
> sage: G.automorphism_group(algorithm='bliss')
> ---------------------------------------------------------------------------
> ImportError Traceback (most recent call
> last)
> <ipython-input-2-8e034558a836> in <module>()
> ----> 1 G.automorphism_group(algorithm='bliss')
>
> /usr/local/src/sage-config/local/lib/python2.7/site-
> packages/sage/graphs/generic_graph.pyc in automorphism_group(self,
> partition, verbosity, edge_labels, order, return_group, orbits,
> algorithm)
> 20074 from sage.graphs.bliss import automorphism_group
> 20075 except ImportError:
> > 20076 raise ImportError("You must install the 'bliss'
> package to run this command.")
> 20077
> 20078 A = automorphism_group(self, partition)
>
> ImportError: You must install the 'bliss' package to run this command.
> }}}
New description:
We add some magic to the Sage setup scripts such that `OptionalExtension`s
whose package is not installed automatically raise an user-friendly
exception:
{{{
sage: G = graphs.PetersenGraph()
sage: G.automorphism_group(algorithm='bliss')
---------------------------------------------------------------------------
PackageNotFoundError Traceback (most recent call
last)
<ipython-input-2-8e034558a836> in <module>()
----> 1 G.automorphism_group(algorithm='bliss')
/usr/local/src/sage-config/local/lib/python2.7/site-
packages/sage/graphs/generic_graph.pyc in automorphism_group(self,
partition, verbosity, edge_labels, order, return_group, orbits, algorithm)
20062 if edge_labels:
20063 raise ValueError("bliss cannot be used when
edge_labels is True")
> 20064 from sage.graphs.bliss import automorphism_group
20065
20066 A = automorphism_group(self, partition)
PackageNotFoundError: the package 'bliss' was not found. You can install
it by running 'sage -i bliss' in a shell
}}}
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19622#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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