sympy patch for abstract function

[man74cio]

Generic function are not transformed from sympy to sage.
this patch implement the PR sympy/sympy#12826

Upstream: Fixed upstream, but not in a stable release.

CC: @tscrim @egourgoulhon @rwst

Component: symbolics

Author: Marco Mancini

Branch/Commit: bc21300

Reviewer: Travis Scrimshaw, Marcelo Forets

Issue created by migration from https://trac.sagemath.org/ticket/23496

[man74cio]

Branch: public/22496_patch_sympy_abstact_function

[man74cio]

Changed branch from public/22496_patch_sympy_abstact_function to public/23496_patch_sympy_abstact_function

[sagetrac-git]

Commit: b764ebe

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

b764ebe

Better sympy patch taken from #12826 PR in sympy

[man74cio]

Changed dependencies from 22802 to none

[tscrim]

Changed reviewer from tscrim to Travis Scrimshaw

[tscrim]

comment:6

Is this ready for review?

[man74cio]

comment:7

Yes, pleiade

[man74cio]

comment:8

Yes, please