Hi,
This is very easy to do with Vizard. I've attached some sample code that will have the avatar walk to a random location every time the spacebar is pressed. Let me know if something isn't clear.
Code:
import viz
viz.go()
#Initialize environment
viz.clearcolor(viz.GRAY)
viz.add('tut_ground.wrl')
viz.move(0,5,-20)
viz.lookat(0,0,0)
#Create an avatar
avatar = viz.add('female.cfg')
#Create a walk action that will randomly select a location between (-5,-5) and (5,5)
RandomWalkAction = vizact.walkto(vizact.randfloat(-5,5),0,vizact.randfloat(-5,5))
#Add walk action to avatar when spacebar is pressed
vizact.onkeydown(' ',avatar.add,RandomWalkAction)