Amida-kuji (ladder lottery)

amida.py

#coding: utf-8

import os
import random

def write_u(u):
    os.sys.stdout.write(u.encode("utf-8"))

no_beam = u"\u2502"
beam_right = u"\u251C"
beam_left = u"\u2524"

width = 15
height = 10

for y in range(height):
    prev_pillar_having_beam = False
    for x in range(width):
        if prev_pillar_having_beam:
            write_u(beam_left)
            prev_pillar_having_beam = False
        else:
            if x < width - 1 and random.choice((True, False)):
                write_u(beam_right)
                prev_pillar_having_beam = True
            else:
                write_u(no_beam)
                prev_pillar_having_beam = False
    write_u("\n")