Python:If/Elif会两次问单个问题，而不是在回答之后继续问？

我向用户询问字典中的一组问题：

questions = {
  "strong": "Do ye like yer drinks strong? ",
  "salty": "Do ye like it with a salty tang? ",
  "bitter": "Are ye a lubber who likes it bitter? ",
  "sweet": "Would ye like a bit of sweetness with yer poison? ",
  "fruity": "Are ye one for a fruity finish? "
}

ingredients = {
  "strong": ["glug of rum", "slug of whiskey", "splash of gin"],
  "salty": ["olive on a stick", "salt-dusted rim", "rasher of bacon"],
  "bitter": ["shake of bitters", "splash of tonic", "twist of lemon peel"],
  "sweet": ["sugar cube", "spoonful of honey", "splash of cola"],
  "fruity": ["slice of orange", "dash of cassis", "cherry on top"]
}

beverage = {}


def drink():
  """Find out user preferences and assign to new dictionary"""
  if raw_input(questions["strong"]).lower() == "yes":
    beverage["strong"] = ingredients["strong"]
  elif raw_input(questions["strong"]).lower() == "no":
    return False
  if raw_input(questions["salty"]).lower() == "yes":
    beverage["salty"] = ingredients["salty"]
  elif raw_input(questions["salty"]).lower() == "no":
    return False

...


drink()

这些键与另一个字典关联：

questions = {
  "strong": "Do ye like yer drinks strong? ",
  "salty": "Do ye like it with a salty tang? ",
  "bitter": "Are ye a lubber who likes it bitter? ",
  "sweet": "Would ye like a bit of sweetness with yer poison? ",
  "fruity": "Are ye one for a fruity finish? "
}

ingredients = {
  "strong": ["glug of rum", "slug of whiskey", "splash of gin"],
  "salty": ["olive on a stick", "salt-dusted rim", "rasher of bacon"],
  "bitter": ["shake of bitters", "splash of tonic", "twist of lemon peel"],
  "sweet": ["sugar cube", "spoonful of honey", "splash of cola"],
  "fruity": ["slice of orange", "dash of cassis", "cherry on top"]
}

beverage = {}


def drink():
  """Find out user preferences and assign to new dictionary"""
  if raw_input(questions["strong"]).lower() == "yes":
    beverage["strong"] = ingredients["strong"]
  elif raw_input(questions["strong"]).lower() == "no":
    return False
  if raw_input(questions["salty"]).lower() == "yes":
    beverage["salty"] = ingredients["salty"]
  elif raw_input(questions["salty"]).lower() == "no":
    return False

...


drink()

我通过每个问题的“简单”if/elif集合向他们提问，并将他们的答案分配到新词典中：

questions = {
  "strong": "Do ye like yer drinks strong? ",
  "salty": "Do ye like it with a salty tang? ",
  "bitter": "Are ye a lubber who likes it bitter? ",
  "sweet": "Would ye like a bit of sweetness with yer poison? ",
  "fruity": "Are ye one for a fruity finish? "
}

ingredients = {
  "strong": ["glug of rum", "slug of whiskey", "splash of gin"],
  "salty": ["olive on a stick", "salt-dusted rim", "rasher of bacon"],
  "bitter": ["shake of bitters", "splash of tonic", "twist of lemon peel"],
  "sweet": ["sugar cube", "spoonful of honey", "splash of cola"],
  "fruity": ["slice of orange", "dash of cassis", "cherry on top"]
}

beverage = {}


def drink():
  """Find out user preferences and assign to new dictionary"""
  if raw_input(questions["strong"]).lower() == "yes":
    beverage["strong"] = ingredients["strong"]
  elif raw_input(questions["strong"]).lower() == "no":
    return False
  if raw_input(questions["salty"]).lower() == "yes":
    beverage["salty"] = ingredients["salty"]
  elif raw_input(questions["salty"]).lower() == "no":
    return False

...


drink()

最后，打印饮料：

print beverage

如果用户说“是”，一切正常

但是，如果用户回答“否”，则会再次询问第一个问题（可能是因为我使用raw_input（）的if/elif结构），然后跳过完成脚本的所有其他问题

我如何构造它，以便如果用户对第一个问题说“不”，那么它会问下一个问题，而不是每个问题问两次

打印输出：

Do ye like yer drinks strong? yes                                                                                                                                            
Do ye like it with a salty tang? no                                                                                                                                          
Do ye like it with a salty tang? yes                                                                                                                                         
Are ye a lubber who likes it bitter? no                                                                                                                                      
Are ye a lubber who likes it bitter? yes                                                                                                                                     
Would ye like a bit of sweetness with yer poison? no                                                                                                                         
Would ye like a bit of sweetness with yer poison? yes                                                                                                                        
Are ye one for a fruity finish? no                                                                                                                                           
Are ye one for a fruity finish? yes                                                                                                                                          
Yer cocktail is a made of a                                                                                                                                                  
['glug of rum']  

---

出现此问题的原因是在每个

if..elif

案例中都会得到一个新的输入字符串。相反，您需要将输入分配给一个变量，并使用

if..elif

检查输入是否正确

问两次问题：

if raw_input(questions["strong"]).lower() == "yes":
    beverage["strong"] = ingredients["strong"]
elif raw_input(questions["strong"]).lower() == "no":
    return False

问一次问题：

answer = raw_input(questions["strong"]).lower()
if answer == "yes":
    beverage["strong"] = ingredients["strong"]
elif answer == "no":
    return False

---

嗯，您的elif中还有另一个

原始输入

，它将读取一个新输入。将返回值赋给一个变量并使用它。