Since this upgrade of SymPy (especially by this commit) the Mathics interface is broken:

sage: slist = [[1, 2], 3., 4 + I]
sage: mlist = mathics(slist)
sage: mlist.sage()
Traceback (most recent call last):
...
NotImplementedError: conversion to SageMath is not implemented

Here we implement a fix of that.

Component: interfaces

Keywords: Mathics inteface SymPy

Author: Sebastian Oehms

Branch/Commit: 4302109

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/33584