我該如何循環？

Question

因此，我正在製作一個簡單的遊戲，其中用戶從邊界國家攻擊一個國家，但我遇到了一個問題，因爲我無法想出一個簡單的方法來擴展此代碼，因爲我正在計劃在遊戲中增加更多的國家。最終產品將與風險類似，但如果一切按計劃進行，則會更加複雜。此代碼正常工作，但我期望更容易擴展。把這看作是一個粗略的草案。

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

你幾乎肯定要更換你的具體變量與數據結構（如字典）每個國家使用該國的名字作爲重點。所以，而不是指USA_REGION_DATA，你會查找REGION_DATA["USA"]。這可以擴展到任何國家，因爲您可以簡單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）將是通用的，與個別國家沒有特殊的外殼：

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!")