Olà in Python / ASCII art

ola.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-
import os
import time
import random

ncols = 26
nrows = 20

def cls():
    os.system(['clear', 'cls'][os.name == 'nt'])

def ola():
    i = 0
    yield i
    while True:
        i = (i + 1) % ncols
        yield i

def ola_row(length, center, width=1):
    figures = []
    for j in xrange(length):
        if i - width/2 + 1 <= j <= i + width/2 + (width%2):
            figures.append('\o/')
        else:
            figures.append('.o.')
    return "".join(figures)

ola_widths = [ random.randint(1, ncols/6) for i in xrange(nrows)]
for i in ola():
    cls()
    line = ola_row(ncols, i, 3)
    print "\n".join([ola_row(ncols, i, width) for width in ola_widths])
    time.sleep(0.2)