revert using sympy.sign

Author: mmatera

mathics/builtin/makeboxes.py

@@ -400,7 +400,7 @@ def eval_general(self, expr, f, evaluation):
             result.append(to_boxes(String(right), evaluation))
             return RowBox(*result)
 
-    def eval_outerprecedenceform(self, expr, precedence, form, evaluation):
+    def no_eval_outerprecedenceform(self, expr, precedence, form, evaluation):
         """MakeBoxes[PrecedenceForm[expr_, precedence_],
         form:StandardForm|TraditionalForm|OutputForm|InputForm]"""
 

mathics/eval/arithmetic.py

@@ -256,13 +256,6 @@ def eval_Sign(expr: BaseElement) -> Optional[BaseElement]:
     """
     if expr is a number, return its sign.
     """
-    sympy_expr = expr.to_sympy()
-    if sympy_expr is not None:
-        print("   sympy_expr", sympy_expr)
-        result = from_sympy(sympy.sign(sympy_expr))
-        if result is not None:
-            return result
-    return None
 
     def eval_complex_sign(n: BaseElement) -> Optional[BaseElement]:
         if isinstance(n, Complex):