如何创建一个python菜单，其中选项是可选择的和不可选择的？

Question

我想创建一个带有编号的菜单选项的 python 菜单，当您选择其中一个选项时，旁边会出现一个 x 以表明该特定选项已被选中。然后，如果用户再次选择该选项，我希望 x 消失以表明该选项不再被选中。

以下是我希望我的程序执行的示例图像：

1. The Menu is blank.

2. The option that was selected has a little x next to it.

3. When selected again, the option becomes blank again.

   到目前为止，这是我的测试代码：

   test = print("1. Normal Character Generator({})".format(""))
   test2 = print("2. Advanded Appearance Generator({})".format(""))
   
   
   def normalGenerationTrue():
       test = print("1. Normal Character Generator({})".format("X"))
   
   
   while True:
       try:
           selection = int(input("Please choose one of the menu options.\n"))
   
           if selection == 1:
               normalGenerationTrue()
               new = input("Would you like to make another selection?").lower()
               if new == "yes":
                   print(test)
               elif new == "no":
                   break
           elif selection == 2:
               advancedGenerationTrue()
               break
           else:
               print("Invalid Choice. Enter one of the menu numbers.")
               test = print("1. Normal Character Generator({})".format(""))
               test2 = print("2. Advanded Appearance Generator({})".format(""))
       except ValueError:
           print("Invalid Choice. Enter one of the menu numbers.")
   
   

Answer 1

您应该将菜单保留在列表中

menu = [
   "1. Normal Character Generator",
   "2. Advanded Appearance Generator",
]

并将最后选择保留在变量中（0 表示不选择）

selected = 0

稍后您可以使用这两个值来显示带有或不带有X 的菜单

def display_menu(menu, selected):
    for number, item in enumerate(menu, 1):
        if number == selected:
            print('(X)', item)
        else:
            print('( )', item)

稍后您必须将新值分配给selected

while True:
    display_menu(menu, selected)

    try:
        # don't assign directly to `selected` because user may choose wrong number
        new_selection = int(input("Please choose one of the menu options.
"))

        if new_selection in (1, 2):
            # assign to `selected` when user choose correct number
            selected = new_selection

            display_menu(menu, selected)
 
            new = input("Would you like to make another selection? [Y/n]").lower()

            if new in ("n", "no"):
                break
        else:
            print("Invalid Choice. Enter one of the menu numbers.")
    except ValueError:
        print("Invalid Choice. Enter one of the menu numbers.")

顺便提一句：

我将(X)( ) 放在行首，因为它更具可读性 - 许多程序将它放在行首（类似于 GUI 中的复选框）。

在第二个问题中，我还检查了n，因为只写n 而不是no 更简单。许多程序都这样做。

我还使用文本[Y/n]（类似于其他程序）来显示可能的选择-n 或y。上面的Y 是通知用户这是默认值的流行方法，如果他/她只按Enter（不输入y）将使用该值。

---

完整代码：

menu = [
    "1. Normal Character Generator",
    "2. Advanded Appearance Generator",
]

selected = 0

def display_menu(menu, selected):
    for number, item in enumerate(menu, 1):
        if number == selected:
            print('(X)', item)
        else:
            print('( )', item)
    
while True:
    display_menu(menu, selected)

    try:
        # don't assign directly to `selected` because user can choose wrong number
        new_selection = int(input("Please choose one of the menu options.
>> "))

        if new_selection in (1, 2):
            # assign to `selected` because it it correct number
            selected = new_selection

            display_menu(menu, selected)
 
            new = input("Would you like to make another selection? [Y/n]
>> ").lower()

            if new in ("n", "no"):
                break
        else:
            print("Invalid Choice. Enter one of the menu numbers.")
    except ValueError:
        print("Invalid Choice. Enter one of the menu numbers.")

结果：

( ) 1. Normal Character Generator
( ) 2. Advanded Appearance Generator
Please choose one of the menu options.
>> 1
(X) 1. Normal Character Generator
( ) 2. Advanded Appearance Generator
Would you like to make another selection? [Y/n]
>> 
(X) 1. Normal Character Generator
( ) 2. Advanded Appearance Generator
Please choose one of the menu options.
>> 2
( ) 1. Normal Character Generator
(X) 2. Advanded Appearance Generator
Would you like to make another selection? [Y/n]
>> y
( ) 1. Normal Character Generator
(X) 2. Advanded Appearance Generator
Please choose one of the menu options.
>> 1
(X) 1. Normal Character Generator
( ) 2. Advanded Appearance Generator
Would you like to make another selection? [Y/n]
>> n