program don`t running

[green]

# -*- coding: cp949 -*-

#작은 전류 요소에 의한 자기장

#저자: 

#날짜: 2016-12-01

from visual import *

scene.height = scene.width = 800

L = 5.e-9

scene.range = L

#상수

m_const = 1.e-7 #자기 상수

#작은 전류 요소

source_current = 1.   #전류(암페어)

source_axis = vector(0, 0.01*L, 0) #dl 벡터

source_pos = vector(0,-10*L,0) #위치

curve(pos=[(0, -10.*L, 0),(0, 10.*L, 0)], color=color.green)#dl 방향 연장선

#관찰 위치

obs_radius = 0.4*L #관찰 위치 반지름

d_theta = pi/3.

length = 2*L #자기장을 그릴 전체 거리

obs_y = -10*L #최초 관찰 위치 y 좌표

dy = L/10. #관찰 위치 증가분

obs = [source_pos] #관찰 위치 리스트

obs1 = source_pos

while obs_y < 10*L:

    obs1.y += dy

    obs.append(obs1)

I made this source, but It doesn`t running. I think 'while' is problem, but I don`t know the reason. What is problem?

   

[Kevin Karplus]

I don't see a "rate" call within the while loop.

See http://vpython.org/contents/docs/rate.html

Kevin Karplus   kar...@soe.ucsc.edu    http://www.soe.ucsc.edu/~karplus
Professor of Biomolecular Engineering, University of California, Santa Cruz

​Author of Applied Electronics for Bioengineers​

Affiliations for identification only.

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[Bruce Sherwood]

Also, you continually add positions to the list named "obs" but you don't make any changes to the curve object.