Raphics2

from random import randint
from time import sleep
cha = '""--__'
a = [cha]

for i in range(1,40):
    a.append(' ')
le = len(a)
def pr(a):
    b = []
    a.reverse()
    b = list(a)
    a.reverse()
    print '[',
    for i in range(le):
        print a[i],
        print b[i],
    print ']'
def nex(a):
    lo = a.index(cha)
    if lo == 0:
        a[0] = ' '
        a[randint(0,1)] = cha
    elif lo == le-1:
        a[le-1] = ' '
        a[randint(le-2,le-1)] = cha
    else:
        a[lo] = ' '
        a[randint(lo-1,lo+1)] = cha
while True:
    pr(a)
    nex(a)
    sleep(0.01)