Question

我无法使这段代码的底部起作用。我希望用户能够键入“ back”并返回主菜单。有没有人可以提供帮助，并且可以解释为什么它无法像我在这里所做的那样起作用？

我已经尝试过更多版本的同一件事，也尝试过使用“ if rf.read（）==“ back”“，但我只是无法弄清楚它而已，这使我很烦恼，因此用户可以返回。现在的样子，如果他们不知道文件名或想回去检查它们是否会卡住导入os，sys

def loop():
    while True:
        choice = menuchoice()
        choiceexec(choice)


def menuchoice():
    showmenu()
    while True:
        validchoices = [1, 2, 3, 4, 5, 6, 7]
        try:
            choice = int(input("What would you like to do? "))

            if choice not in validchoices:
                print(repr(choice) + "Invalid menu choice")

            if choice in validchoices:
                return choice

        except ValueError:
            print("Invalid choice. Try again!")

def showmenu():
    print("1 - Show current directory path")
    print("2 - Show file names in current directory")
    print("3 - Show all directories and files in current path")
    print("4 - Enter new directory path")
    print("5 - Read a .txt file in current directory")
    print("6 - Write in a .txt file in current directory")
    return

def choiceexec(x):
    if x == 1:
        showdirectory()
    if x == 2:
        filesindir()
    if x == 3:
        allinfo()
    if x == 4:
        newpath()
    if x == 5:
        opentxtfile()
    if x == 6:
        writetxtfile()
    if x == 7:
        exit()




#def:
def showdirectory():
    print(os.getcwd())
    print("\n")

def filesindir():
    print(os.listdir())
    print("\n")

def allinfo():
    for dirpath, dirnames, filenames in os.walk(".", topdown=False):
        print("Current path: ", dirpath)
        print("Directories: ", dirnames)
        print("Files: ", filenames)
        print("\n")



def newpath():
    pathinput = input("Enter new directory path: ")
    os.chdir(pathinput)
    print("Current path is now:", pathinput)
    print("\n")
    return


def opentxtfile():

    openfile = input("Enter the .txt file name: ")
    with open(openfile, 'r') as f:
        f_content = f.read()
        print(f_content)
        print("\n")
        f.close()

def writetxtfile():

    try:
        openfile = input("Enter the .txt file name, or type 'back' to go back to menu: ")
        with open(openfile, 'r') as rf:
            f_content = rf.read()
            print("Current file text:",f_content)
            print("\n")
        writeinput  = input("What would you like to write?")
        with open(openfile, 'a') as wf:
            wf.write(" " + writeinput)
            wf.close()
    except:
        print("Invalid input")
        writetxtfile()
    else:                               #### not working
        if openfile == "back":
            return


def exit():
    sys.exit()

loop()

Answer 1

您可能希望将writetxtfile()更改为：

def writetxtfile():
    try:
        openfile = input("Enter the .txt file name, or type 'back' to go back to menu: ")
        if openfile == "back":
            return
        else:
            with open(openfile, 'r') as rf:
                f_content = rf.read()
                print("Current file text:",f_content)
                print("\n")
            writeinput  = input("What would you like to write?")
            with open(openfile, 'a') as wf:
                wf.write(" " + writeinput)
                wf.close()
    except:
        print("Invalid input")
        writetxtfile()

无法让我的程序返回主循环

1 个答案: