返回python中的主菜单

只是一个简单的例子（我对Python编码非常陌生，但如果有帮助的话，我有一年左右的R编程经验）

我在下面有一个我的编码打印输出，在这里我有一个菜单，用户可以选择一个选项，引导他们进入某个活动（a、B、C、D、X），这比我发布的内容更为重要，但我不想提交更大的文本代码墙

def printMenu ():
    print("Playing Statistics Calculator")
    print("A: Positions in Basketball and relevent Key Performance Indicators")
    print("B: Calculate your per-game statistics")
    print("C: Compare your statistics to other players in your position")
    print("X: Exit")

def main():
    choice = printMenu()
    choice

main()

selection = input("Please choose a selection: ")

if selection == "A":
    print("You are interested in looking at the Key Performance Indicators (KPIs) that we think are important for each position. Please select a position below:")
    main()
    selection
elif selection == "B":
    print("Now you know the important KPIs related to each position, which position are you interested in, in our team?")
    main()
    selection
elif selection == "D":
    print("comparison calculations in here")
    main()
    selection
elif selection == "X":
    exit()
else:
    print("Try again, please ensure the letters are in capitals and are shown in menu")
    main()
    selection

我的问题是，当我试图在活动结束时将用户带回主菜单时，它会按预期打印菜单，但不允许用户输入选择，如果允许，它只会停止程序，而不是循环并再次正确运行

---

任何建议将是伟大的，请提前感谢

尝试以下结构

def printMenu():
    print("Playing Statistics Calculator")
    print("A: Positions in Basketball and relevent Key Performance Indicators")
    print("B: Calculate your per-game statistics")
    print("C: Compare your statistics to other players in your position")
    print("X: Exit")
    return input("Please choose a selection: ").upper()

def program(selection):
    if selection == "A":
        print("You are interested in looking at the Key Performance Indicators (KPIs) that we think are important for each position. Please select a position below:")
    elif selection == "B":
        print("Now you know the important KPIs related to each position, which position are you interested in, in our team?")
    elif selection == "C":
        print("comparison calculations in here")
    else:
        print("Try again, please ensure the letter is shown in the menu.")

selection = printMenu()
while selection != 'X':
    program(selection)
    print()
    selection = printMenu()     

---

尝试以下结构

def printMenu():
    print("Playing Statistics Calculator")
    print("A: Positions in Basketball and relevent Key Performance Indicators")
    print("B: Calculate your per-game statistics")
    print("C: Compare your statistics to other players in your position")
    print("X: Exit")
    return input("Please choose a selection: ").upper()

def program(selection):
    if selection == "A":
        print("You are interested in looking at the Key Performance Indicators (KPIs) that we think are important for each position. Please select a position below:")
    elif selection == "B":
        print("Now you know the important KPIs related to each position, which position are you interested in, in our team?")
    elif selection == "C":
        print("comparison calculations in here")
    else:
        print("Try again, please ensure the letter is shown in the menu.")

selection = printMenu()
while selection != 'X':
    program(selection)
    print()
    selection = printMenu()     

---

问题是，当您对else/if语句调用“selection”时，它不会返回到处理输入，因此我认为最好的选择是将该部分也定义为函数，并在必要时调用它

def printMenu ():
    print("Playing Statistics Calculator")
    print("A: Positions in Basketball and relevent Key Performance Indicators")
    print("B: Calculate your per-game statistics")
    print("C: Compare your statistics to other players in your position")
    print("X: Exit")

def main():
    choice = printMenu()
    choice

main()

def processInput()
    selection = input("Please choose a selection: ")
    if selection == "A":
        print("You are interested in looking at the Key Performance Indicators (KPIs) that we think are important for each position. Please select a position below:")
        main()
        processInput()
    elif selection == "B":
        print("Now you know the important KPIs related to each position, which position are you interested in, in our team?")
        main()
        processInput()
    elif selection == "D":
        print("comparison calculations in here")
        main()
        processInput()
    elif selection == "X":
        exit()
    else:
        print("Try again, please ensure the letters are in capitals and are shown in menu")
        main()
        processInput()

processInput()

---

我会这样做，尽管您应该做最适合您的程序的事情，但问题是，当您在else/if语句上调用“selection”时，它不会返回到处理输入，因此我认为最好的选择是将该部分也定义为函数，并在必要时调用它

def printMenu ():
    print("Playing Statistics Calculator")
    print("A: Positions in Basketball and relevent Key Performance Indicators")
    print("B: Calculate your per-game statistics")
    print("C: Compare your statistics to other players in your position")
    print("X: Exit")

def main():
    choice = printMenu()
    choice

main()

def processInput()
    selection = input("Please choose a selection: ")
    if selection == "A":
        print("You are interested in looking at the Key Performance Indicators (KPIs) that we think are important for each position. Please select a position below:")
        main()
        processInput()
    elif selection == "B":
        print("Now you know the important KPIs related to each position, which position are you interested in, in our team?")
        main()
        processInput()
    elif selection == "D":
        print("comparison calculations in here")
        main()
        processInput()
    elif selection == "X":
        exit()
    else:
        print("Try again, please ensure the letters are in capitals and are shown in menu")
        main()
        processInput()

processInput()

---

我会这样做，尽管您应该做最适合您的程序的事情

在

if-else

部分中

选择

意味着什么？它什么也不做。在

if-else

部分中，

选择

意味着什么？它没有任何作用。谢谢！这个很好用，谢谢！这很好用谢谢丹尼尔，这也很好用！谢谢丹尼尔，这也很好用！