teams = [“a”,“b”,“c”,“d”] count = 0 for i in range(len(teams)): for j in range(len(teams)): if j == i: continue else: count += 1 print("(主场)" + str(teams[i]) + " vs (客场)" + str(teams[j])) print(“4支球队在双循环赛制下总共打”+str(count)+“场比赛”)