Fix Expression.__rsub__

diff --git a/pypol/linear.py b/pypol/linear.py
index de6f4ca1d71b047fb76981c045b3fc7c6d8fe83e..c169049b2d42d3bba4c80cfdba9d72afdc6a7eea 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -158,7 +158,8 @@ class Expression:
         constant = self.constant - other.constant
         return Expression(coefficients, constant)
 
-    __rsub__ = __sub__
+    def __rsub__(self, other):
+        return -(self - other)
 
     @_polymorphic_method
     def __mul__(self, other):

diff --git a/tests/test_linear.py b/tests/test_linear.py
index 93fc8386577f5868d0334da127c4caa19f66edb5..4079d7501fe280321955761d04ef95af275288b6 100644 (file)
--- a/tests/test_linear.py
+++ b/tests/test_linear.py
@@ -99,6 +99,7 @@ class TestExpression(unittest.TestCase):
     def test_sub(self):
         self.assertEqual(self.x - self.x, 0)
         self.assertEqual(self.e - 3, self.x - 2*self.y)
+        self.assertEqual(0 - self.x, -self.x)
 
     def test_mul(self):
         self.assertEqual(self.pi * 7, 22)