problem with exam task for college

[jeltedeproft at hotmail.com]

this is what i have right now, it tells me i can't multiply a vector with a vector, i have to find a way to multiply the speed with the updated angle (=hoek in dutch)


code : 

from visual import *
import time
import math
import random

class lunar_lander(object):
    def __init__(self):
        scene.title = 'mini star wars'
        scene.width = 375
        scene.height = 550
        scene.center = (0,0)
        self.pos = (0,0)
        self.axis = 0
        self.brandstofmeter = brandstofmeter()
        self.ruimteschip = ruimteschip()
        self.view = game_view(self)
        
        

    def play(self):
        t=0
        dt=0.01
        while t<999999999:
            time.sleep(0.01)
            self.brandstofmeter.update
            self.ruimteschip.update(dt)
            t = t + dt

            
            
class game_view(object):
    def __init__(self,owner):
        autoscale=True
        box(pos=( 0, -375, 0), length=500, height=5, width=0, color = color.white)
        box(pos=(0,375, 0), length=500, height=5, width=0, color = color.white)
        box(pos=(-250,0, 0), length=5, height=750, width=0, color = color.white)
        box(pos=(250,0, 0), length=5, height=750, width=0, color = color.white)
    
        maan = curve(pos=[(-250,-353),(-240,-341),(-210,-354),(-199.5,-374)],color=color.red)
        maana = curve(pos=[(-199.5,-374),(-166,-374)],color=color.green)
        maanb = curve(pos=[(-166,-374),(-140,-357),(-80,-319),(-40,-361),(0,-321),(40,-329),(80,-347)],color=color.red)
        maanc = curve(pos=[(80,-347),(140,-347)],color=color.green)
        maand = curve(pos=[(140,-347),(162,-337),(189.5,-365),(210,-355),(240,-372),(250,-338)],color=color.red)

        for i in random.sample(range (-250,250),20):
            for j in random.sample(range (-375,375),20):
                sterren = points(pos = [i,j,0],size = 2, color=color.white)


class brandstofmeter(object):
        def __init__(self):
            self.size = (25,45)
            axis = 0
            self.pos = (220,345)
            self.view = brandstofmeter_view(self)
            
        def update(self):
            while True:
                if scene.kb.keys:
                    s = scene.kb.getkey()
                    if (s == 'up'):
                        self.view.update(self)
            
            
            
        
class brandstofmeter_view(object):
    def __init__(self,owner):
        self.owner = owner
        meter = box(pos = owner.pos,size = owner.size,color = color.green)
        
    def update (self,owner):
        self.size = self.size - (0,0.45)
        
                
                    
        
class ruimteschip(object):
    def __init__(self):
        self.pos = vector(0,330)
        self.axis = (1,0,0)
        self.view = ruimteschip_view(self)
        self.vlam = self.view.vlam
        self.frame = self.view.frame
        self.hoek = pi / 2
        
        
        

    def update(self,dt):
        zwaartekracht = vector(0,-2,0)
        self.gas = vector(0,10,0)
        self.acceleration = zwaartekracht
        self.axis = (1,0,0)
        if scene.kb.keys:
            s = scene.kb.getkey()
            if (s == "up"):
                self.acceleration =+ self.gas * vector(math.cos(self.hoek),math.sin(self.hoek))
            if (s == "left"):
                self.hoek =+ pi/12
            if (s == "right") :
                self.hoek =- pi/12
                 
         
        self.pos = self.pos + self.acceleration
        if self.pos.x > 250:
            self.pos.x = -250
        if self.pos.x < -250:
            self.pos.x = 250

        if self.acceleration != (0,-2,0):
            self.vlam.visible = True
        else :
            self.vlam.visible = False
        self.view.update(self)
                    
class ruimteschip_view(object):
    def __init__(self,owner):
        self.owner = owner
        self.frame = frame(pos = owner.pos,axis = owner.axis)
        self.motor = curve(frame = self.frame,pos=[(0,24.0),(22.0,24.0),(22.0,39.0),(-22.0,39.0),(-22,24),(0,24)])
        self.capsule = curve(frame = self.frame,color = color.blue ,pos=[(0,39),(-3,39),(-9,44),(-12,46),(-18,48),(-22,50),(-18,52),(-12,54),(-9,56),(-3,61),(0,61),(3,59),(9,56),(12,54),(18,52),(22,50),(18,48),(12,46),(9,44),(3,39),(0,39)])
        self.poota = curve(frame = self.frame,pos = [(-18,24),(-20,24),(-20,0),(-18,0),(-18,24)])
        self.pootb = curve(frame = self.frame,pos = [(18,24),(20,24),(20,0),(18,0),(18,24)])
        self.vlam = curve(frame = self.frame,color = color.orange , visible=false,pos = [(0,24.0),(-9.0,14.0),(0,-5.0),(9,14.0),(0,24.0)])
        
    def update(self,owner):
        self.frame.axis = owner.axis
        self.frame.pos = owner.pos