for跳出多層循環python
break_flag = False for i in range(10): print("爺爺層",i) for j in range(10): print("=爸爸層",j) if j == 3: break_flag = True break for k in range(10): print("===>孫子層",k ) if k == 2: break_flag = True break if break_flag: break if break_flag: #if break_falg == True: print("我兒子死了,我也不活了..") break print("keep going....")
while跳出多層循環app
#Python學習交流QQ羣:778463939 break_flag = False count = 0 while break_flag == False : print("爺爺層。。。") while break_flag == False: print("爸爸層...") while break_flag == False: count +=1 if count >10: break_flag = True print("炎龍層...") print("keep going....")
跳出多級菜單學習
map={ "華南":{ "廣東":["廣州市","佛山市","深圳市","東莞市"], "廣西":["南寧市","柳州市","桂林市","北海市"], "海南":["海口市","三亞市","三沙市","儋州市"] }, "華東":{ "上海":["黃浦區","盧灣區","徐彙區","長寧區"], "安徽":["合肥市","蕪湖市","淮南市","馬鞍山市"], "江蘇":["南京市","無錫市","徐州市","常州市"] } } flag = False while flag == False: print("中國有以下地區:") for i in map.keys(): print(i) area = input("請選擇一個地區、b或者q:").strip() if area == "b": break if area == "q": flag = True if len(area) == 0: continue if area in map.keys(): while flag == False: print("該地區有以下省:") for j in (map[area]).keys(): print(j) province = input("請選擇一個省、b或者q:").strip() if province == "b": break if province == "q": flag = True if len(province) == 0: continue if province in (map[area]).keys(): while flag == False: print("該省有以下城市:") for j in map[area][province]: print(j) city = input("請選擇b或者q:") if city == "b": break if city == "q": flag = True if len(city) == 0: continue
跳出多層循環簡化版google
menu = { '北京':{ '海淀':{ '五道口':{ 'soho':{}, '網易':{}, 'google':{} }, '中關村':{ '愛奇藝':{}, '汽車之家':{}, 'youku':{}, }, '上地':{ '百度':{}, }, }, '昌平':{ '沙河':{ '老男孩':{}, '北航':{}, }, '天通苑':{}, '回龍觀':{}, }, '朝陽':{}, '東城':{}, }, '上海':{ '閔行':{ "人民廣場":{ '炸雞店':{} } }, '閘北':{ '火車戰':{ '攜程':{} } }, '浦東':{}, }, '山東':{}, } last_layers = [ menu ] #上一層 current_layer = menu #當前層 while True: for key in current_layer: print(key) choice = input(">>:").strip() if len(choice)==0:continue if choice in current_layer: #進入下一層 last_layers.append(current_layer) #當前層添加到列表 current_layer = current_layer[choice] #北京 if choice == "b": if last_layers: current_layer = last_layers[-1] #取到上一層,賦值給current_layer last_layers.pop() if choice == 'q': break