栗まんじゅう

gistfile1.py

import threading
import time

def kuriman():
     kuriman = 1
     while 1:
        kuriman = kuriman * 2 if kuriman > 1 else 2
        yield kuriman

def byby():
    manju = kuriman()
    while 1:
        print 
        print "()" * manju.next(),
        time.sleep(30)

def main():
    t = threading.Thread(target = byby)
    t.setDaemon(True)
    t.start()
    while 1:pass

if __name__ == "__main__":main()