我该如何循环？

Question

因此，我正在制作一个简单的游戏，其中用户从边界国家攻击一个国家，但我遇到了一个问题，因为我无法想出一个简单的方法来扩展此代码，因为我正在计划在游戏中增加更多的国家。最终产品将与风险类似，但如果一切按计划进行，则会更加复杂。此代码正常工作，但我期望更容易扩展。把这看作是一个粗略的草案。

countries=['USA','MEXICO','CANADA'] 

#ignore MILITARYGROWTHRATE, that will be put to use later in production, I just added it in early 

USA_REGION_DATA={'Bordering':['MEXICO','CANADA'],'MILITARYGROWTHRATE':1.03} 
MEXICO_REGION_DATA={'Bordering':['USA'],'MILITARYGROWTHRATE':1.01} 
CANADA_REGION_DATA={'Bordering':['USA'],'MILITARYGROWTHRATE':1.01} 

def attack(origin,target): 
    '''Origin is where you are attacking from, 
    target is who you are attacking''' 
    x=origin.upper() 
    y=target.upper() 
    if x not in countries: 
     print("You must attack from somewhere!") 
    elif x=='USA': 
     if y not in USA_REGION_DATA['Bordering']: 
      print("Not a valid target") 
     else: 
      print("Attack is underway!") 
    elif x=='MEXICO': 
     if y not in MEXICO_REGION_DATA['Bordering']: 
      print("Not a valid target") 
     else: 
      print("Attack is underway!") 
    elif x=='Canada': 
     if y not in CANADA_REGION_DATA['Bordering']: 
      print("Not a valid target") 
     else: 
      print("Attack is underway!") 

print("Are you attacking from the USA, Mexico, or Canada?") 
origin=raw_input() 
if origin.upper()=='USA': 
    print("Are you attacking Mexico or Canada?") 
    target=raw_input() 
    print("Are you sure you want to attack "+target+"? (Yes or No)") 
    answer=raw_input() 
    if answer.upper()=='YES': 
     attack(origin,target) 
    else: 
     print("You'll never get anything done by sitting around...") 
else: 
    print("Are you sure you want to attack the USA?(Yes or No)") 
    if raw_input().upper()=='YES': 
     target='USA' 
     attack(origin,target) 
    else: 
     print("You'll never get anything done by sitting around...") 

Answer 1

你几乎肯定要更换你的具体变量与数据结构（如字典）每个国家使用该国的名字作为重点。所以，而不是指USA_REGION_DATA，你会查找REGION_DATA["USA"]。这可以扩展到任何国家，因为您可以简单地向字典添加新的值。

REGION_DATA = { "USA": {'Bordering':['MEXICO','CANADA'],'MILITARYGROWTHRATE':1.03}, 
       "MEXICO": {'Bordering':['USA'],'MILITARYGROWTHRATE':1.01}, 
       "CANADA": {'Bordering':['USA'],'MILITARYGROWTHRATE':1.01} 
       } 

你attack功能（和其他人）将是通用的，与个别国家没有特殊的外壳：

你可以像初始化

def attack(origin,target): 
    '''Origin is where you are attacking from, 
    target is who you are attacking''' 
    x=origin.upper() 
    y=target.upper() 
    if x not in REGION_DATA: 
     print("You must attack from somewhere!") 
    elif y not in REGION_DATA[x]['Bordering']: # extra indexing by x here 
     print("Not a valid target") 
    else: 
     print("Attack is underway!")