from collections import deque import random def build_schedule(_teamarr):   scheduleobj = dict.fromkeys(range(1,20))   fixpos = _teamarr[0]   ring = _teamarr[1:]   ring = deque(ring)   #前半賽程，1-19輪(round)   for round in range(1,20):     #第1支球隊不動，再加上輪轉(rotate)的環     teams = [fixpos] + list(ring)     #切成2列，左邊主隊，右邊客隊     home, away = teams[:len(teams)/2],teams[len(teams)/2:]     away = away[::-1]     #隨機打亂主客隊     scheduleobj[round] = [(x,y) if random.random()>=0.5 else (y,x) for x,y in zip(home,away)]     ring.rotate(1)   #后半賽季對陣跟前半賽季一樣，但主客隊對調   for round in range(20,39):     scheduleobj[round] = [(y,x) for x,y in scheduleobj[round-19]]   return scheduleobj  if __name__ == '__main__':   teamarr = [u'曼聯', u'阿斯頓維拉', u'切爾西', u'西漢姆', u'富勒姆',         u'熱刺', u'利物浦', u'南安普頓', u'埃弗頓', u'諾維奇',         u'紐卡斯爾', u'曼城', u'斯托克城', u'桑德蘭', u'水晶宮',         u'西布羅姆維奇', u'阿森納', u'赫爾城', u'卡迪夫城', u'斯旺西']   scheduleobj = build_schedule(teamarr)   print u'---聯賽第1輪---'   for h,a in scheduleobj[1]:     print u'{}-{}'.format(h,a)    print u'---聯賽第2輪---'   for h,a in scheduleobj[2]:     print u'{}-{}'.format(h,a)