Python文本循环

Question

我想要做的是当它到达else并打印错误时我希望它循环回到choice1。

choice1 = input("Were would " + name + " like to go?\nThe Kitchen\nThe Couch\nOutside")
if choice1 == "The Kitchen":
  choices.append("The Kitchen")
  print(name + " walked towards The Kitchen.")
elif choice1 == "The Couch":
  choices.append("The Couch")
  print(name + " went and had sat on The Couch.")
elif choice1 == "Outside":
  choices.append("Outside")
  print(name + " put on their pack and went out the door.")
else:
  print("error")

如果有错误/它到达其他地方我希望它循环回到choice1。

Answer 1

我会尽力回答pythonic的方式（即使我不认为自己是Python专家）：Python非常适合列表和词典，你可以避免像switch / case这样的东西。这是你对Python方式的比较：

name = "Olivier"
possible_choices = {
   "The Kitchen": lambda name: "{} walked towards The Kitchen.".format(name),
   "The Couch": lambda name: "{} went and had sat on The Couch.".format(name),
   "Outside": lambda name: "{} put on their pack and went out the door.".format(name),
}
while True:
    choice = input("Were would {} like to go?\n{}\n>".format(
        name, '\n'.join(possible_choices)))
    if choice in possible_choices:
        print(possible_choices[choice](name))
        break;  # break the loop
    print("error")  # loops

接着就，随即：

• 你没有“开关/案例”，因为Python使它成为可能，
• 如果你只是添加一个键+ lambda一切都会工作
• 因此它更短： 它更容易阅读 它更容易维护 它更容易理解 因此，从长远来看，它对贵公司的成本会降低

学习如何使用在每种现代语言中使用的lambdas（=匿名函数），这个“if choice in possible_choices”非常清晰，几乎可以说是英语！

Answer 2

while True:
    choice1 = raw_input("Were would " + name + " like to go?\nThe Kitchen\nThe Couch\nOutside")
    if choice1 == "The Kitchen":
      choices.append("The Kitchen")      
      print(name + " walked towards The Kitchen.")
      break
    elif choice1 == "The Couch":
      choices.append("The Couch")
      print(name + " went and had sat on The Couch.")
      break
    elif choice1 == "Outside":
      choices.append("Outside")
      print(name + " put on their pack and went out the door.")
      break
    else:
      print("error")
      continue

Answer 3

您可以使用while循环并使if / elif语句使其转义循环。像这样：

a = True
while a:
    choice1 = input("Were would " + name + " like to go?\nThe Kitchen\nThe Couch\nOutside")            
    if choice1 == "The Kitchen":
        choices.append("The Kitchen")
        print(name + " walked towards The Kitchen.")
        a = False
    elif choice1 == "The Couch":
        choices.append("The Couch")
        print(name + " went and had sat on The Couch.")
        a = False
    elif choice1 == "Outside":
        choices.append("Outside")
        print(name + " put on their pack and went out the door.")
        a = False
    else:
        print("error")

a是一个设置为true的布尔语句。该脚本进入while循环，该循环在== True时运行。所有if / elif语句都为false，导致循环结束。