Ticket #3963: trac_3963.patch

a/sage/rings/rational.pyx

@@ -426 +426 @@
-                return "-\\frac{%s}{%s}"%(-self.numer(), self.denom())
-            else:
-               return "\\frac{%s}{%s}"%(self.numer(), self.denom())
+
+    def _sympy_(self):
+        """
+        Convert Sage Rational to SymPy Rational.
+
+        EXAMPLES:
+            sage: n = 1/2; n._sympy_()
+            1/2
+            sage: n = -1/5; n._sympy_()
+            -1/5
+            sage: from sympy import Symbol
+            sage: QQ(1)+Symbol('x')*QQ(2)
+            2*x + 1
+
+        """
+        import sympy
+        return sympy.Rational(int(self.numerator()), int(self.denominator()))
+
-
-    def _mathml_(self):
-        """