self.assertEqual(self.x.subs(self.y, 3), self.x)
self.assertEqual(self.pi.subs(self.x, 3), self.pi)
self.assertEqual(self.expr.subs(self.x, -3), -2 * self.y)
- self.assertEqual(self.expr.subs([(self.x, self.y), (self.y, self.x)]), 3 - self.x)
+ self.assertEqual(self.expr.subs([(self.x, self.y), (self.y, self.x)]), -2*self.x + self.y + 3)
self.assertEqual(self.expr.subs({self.x: self.z, self.y: self.z}), 3 - self.z)
self.assertEqual(self.expr.subs({self.x: self.z, self.y: self.z}), 3 - self.z)
with self.assertRaises(TypeError):