#20185: Upgrade to SymPy-1.0
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       Reporter:  rws                |        Owner:
           Type:  enhancement        |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-7.1
      Component:  packages:          |   Resolution:
  standard                           |    Merged in:
       Keywords:                     |    Reviewers:
        Authors:  Ralf Stephan       |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:                     |  76a47e825dfc3e2cc0d56244ababdc9fb92d5481
  u/rws/upgrade_to_sympy_1_0         |     Stopgaps:
   Dependencies:                     |
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Comment (by rws):

 As you can see from #14723 the `UndefFunction._sage_` addition only
 affects future changes. This branch now has this removed from SymPy-1.0 to
 make it work with current Sage. Any changes to the coercion system because
 of future inclusion of `UndefFunction._sage_` can then be dealt with in a
 separate ticket which I'll open shortly. I didn't do a full test on this,
 so I'll have to have a final look at this tomorrow.

--
Ticket URL: <http://trac.sagemath.org/ticket/20185#comment:22>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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