+= operators

obja.py

@@ -47,15 +47,39 @@ class Vector:
     def __add__(self, other):
         return Vector(self.x + other.x, self.y + other.y, self.z + other.z)
 
+    def __iadd__(self, other):
+        self.x += other.x
+        self.y += other.y
+        self.z += other.z
+        return self
+
     def __sub__(self, other):
         return Vector(self.x - other.x, self.y - other.y, self.z - other.z)
 
+    def __isub__(self, other):
+        self.x -= other.x
+        self.y -= other.y
+        self.z -= other.z
+        return self
+
     def __mul__(self, other):
         return Vector(self.x * other, self.y * other, self.z * other)
 
+    def __imul__(self, other):
+        self.x *= other
+        self.y *= other
+        self.z *= other
+        return self
+
     def __truediv__(self, other):
         return Vector(self.x / other, self.y / other, self.z / other)
 
+    def __itruediv__(self, other):
+        self.x /= other
+        self.y /= other
+        self.z /= other
+        return self
+
     def __repr__(self):
         return str(self)