from OpenGL.GL import *
from OpenGL.GLUT import *

def display():
    glClear(GL_COLOR_BUFFER_BIT)
    glColor3f(0.5, 0.5, 0.0)
    glBegin(GL_LINES)
    glVertex3f(-0.5, 0.0, 0.0)
    glVertex3f(0.5, 0.0, 0.0)
    glEnd()
    glFlush()

def main():
    glutInit(sys.argv)
    glutInitDisplayMode(GLUT_SINGLE)
    glutInitWindowSize(640, 480)
    glutInitWindowPosition(200, 200)
    glutCreateWindow("Hello Vilag!")
    glutDisplayFunc(display)
    glClearColor(0.0, 0.0, 0.0, 0.0)
    glutMainLoop()

main()