rotating a cube in vpython

[ali lolo]

This code:

from vpython import *

import time

class cubelet:

   def __init__(self,x,y,z,c1,c2,c3,c4,c5,c6,):

      self.x=x

      self.y=y

      self.z=z

      self.c1=c1

      self.c2=c2

      self.c3=c3

      self.c4=c4

      self.c5=c5

      self.c6=c6

   def draw(self):

      a=pyramid(pos=vector(self.x-3,self.y,self.z), size=vector(3,6,6),color=self.c1)

      b=pyramid(pos=vector(self.x+3,self.y,self.z), size=vector(3,6,6),color=self.c2,axis=vector(-1,0,0))

      c=pyramid(pos=vector(self.x,self.y,self.z-3), size=vector(3,6,6),color=self.c3,axis=vector(0,0,1))

      d=pyramid(pos=vector(self.x,self.y,self.z+3), size=vector(3,6,6),color=self.c4,axis=vector(0,0,-1))

      e=pyramid(pos=vector(self.x,self.y-3,self.z), size=vector(3,6,6),color=self.c5,axis=vector(0,1,0))

      f=pyramid(pos=vector(self.x,self.y+3,self.z), size=vector(3,6,6),color=self.c6,axis=vector(0,-1,0))

      self.list=[a,b,c,d,e,f]

   def rotate(self):

      for i in self.list:

         i.rotate(angle=90,axis=vec(0,0,1),origin=vector(0,0,0))

i=cubelet(0,0,0,color.white,color.yellow,color.red,color.magenta,color.blue,color.green)

i.draw()

time.sleep(0.2)

i.rotate()

My question is that why the cube doesn't rotate with angle 90 when we run the program? 

[Bruce Sherwood]

Angles must be specified as radians. Either say angle=pi/2 or angle=radians(90).

Another way to organize your program would like this:

def cubelet(....): # a "factory function"

    #create a list of the 6 pyramids, as you do already; suppose its name is L

    return compound(L)

c = cubelet(....)

This "factory function" (a function that returns an object) returns an object that has the usual properties of primitive objects such as box. You can manipulate this compound object by changing c.pos or c.axis, etc. You can create copies of this cubelet:

c2 = c.clone(pos=vec(10,5,0), size=vec(2,1,0.2))

Bruce