Python：If / Elif会问一个问题两次而不是在回答之后继续吗？

Charles Watson 发表于 Dev

查尔斯·沃森

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? "
}

这些键与另一个字典相关联：

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"]
}

然后我通过为每个问题设置“简单” if / elif来问他们问题，并将他们的答案分配给新词典：

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”，则一切正常。

但是，如果用户回答“否”，则会再次询问第一个问题（大概是由于我使用raw_input（）的if / elif结构），然后跳过所有其他问题以完成脚本。

我如何组织它，以便如果用户对第一个问题说“否”，然后又问下一个问题，而不是每个问题两次？

打印：

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']

光与光

发生此问题的原因是，在每种if..elif情况下，您都会获得一个新的输入字符串。相反，您需要将输入分配给变量，然后使用进行检查if..elif。

提出问题两次：

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

提出问题一次：

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

本文收集自互联网，转载请注明来源。

如有侵权，请联系[email protected] 删除。