corrected tractor class, write methods

src/tractor.py

@@ -0,0 +1,12 @@
+from pygame.sprite import Sprite
+
+class Plant(Sprite):
+    def __init__(self,engine,transmission,pos_x,pos_y):
+        super.__init__()
+        self.engine=engine
+        self.transmission=transmission
+        self.pos_x=pos_x
+        self.pos_y=pos_y
+        self.fuel=100
+        
+