Panda3D keyboard moving scene

to glance at panda3d Example Tut-Roaming-Ralph.py;

The character roams through the scene ; Cursor keys control characters ;a、s Key rotation scene ;

pview Take a look at the model of the example , One is the human model , Another is the scene ;

It has a lot of code ; In addition to scene roaming , And collision detection ; collision detection , It is the character who meets the slope , Light up the key and you will climb , Hit the tree , Press the forward cursor key , Characters should not move ; The next round of collision detection ;

Have a look first a and s Key rotation scene ; According to its example, make a general ,

import direct.directbase.DirectStart
from panda3d.core import CollisionTraverser,CollisionNode
from panda3d.core import CollisionHandlerQueue,CollisionRay
from panda3d.core import Filename,AmbientLight,DirectionalLight
from panda3d.core import PandaNode,NodePath,Camera,TextNode
from panda3d.core import Vec3,Vec4,BitMask32
from direct.gui.OnscreenText import OnscreenText
from direct.actor.Actor import Actor
from direct.showbase.DirectObject import DirectObject
import random, sys, os, math

class World(DirectObject):

    def __init__(self):

        self.keyMap = {"left":0, "right":0, "forward":0, "cam-left":0, "cam-right":0}
        base.win.setClearColor(Vec4(0,0,0,1))

        self.environ = loader.loadModel("models/world")      
        self.environ.reparentTo(render)
        self.environ.setPos(0,0,0)
        
        self.accept("a", self.setKey, ["cam-left",1])
        self.accept("s", self.setKey, ["cam-right",1])
       
        taskMgr.add(self.move,"moveTask")
        base.disableMouse()
       
        # Create some lighting
        ambientLight = AmbientLight("ambientLight")
        ambientLight.setColor(Vec4(.3, .3, .3, 1))
        directionalLight = DirectionalLight("directionalLight")
        directionalLight.setDirection(Vec3(-5, -5, -5))
        directionalLight.setColor(Vec4(1, 1, 1, 1))
        directionalLight.setSpecularColor(Vec4(1, 1, 1, 1))
        render.setLight(render.attachNewNode(ambientLight))
        render.setLight(render.attachNewNode(directionalLight))
    
    def setKey(self, key, value):
        self.keyMap[key] = value

    def move(self, task):
        if (self.keyMap["cam-left"]!=0):
            base.camera.setX(base.camera, -20 * globalClock.getDt())
        if (self.keyMap["cam-right"]!=0):
            base.camera.setX(base.camera, +20 * globalClock.getDt())
        return task.cont

w = World()
run()

 

    Scene loaded , hit a or s key , Only one effect , The scene has been moving ; Next time ; 

 self.keyMap = {"left":0, "right":0, "forward":0, "cam-left":0, "cam-right":0}

python I'm not familiar with the grammar of , This map The array doesn't seem to be declared first , Just assign the value directly ;