用户输入的Python FileNotFoundError

我正在制作一个程序，将文件内容加密为密文。我的问题是，当我的程序要求用户输入他们想要加载的文件名，而用户没有给出有效的响应时，就会出现“FileNotFoundError:”。我希望我的程序有一个功能，如果用户没有给出有效的响应，程序将继续告诉用户重试

def EncryptCode():
    encryptFileLoad = input("Name the file and directory you want to load with the ending '.txt':\n") 
    with open (encryptFileLoad,mode="r",encoding="utf=8") as encrypt_file:
        encryptFile = encrypt_file.read()

我得到一个类似这样的错误：

Traceback (most recent call last):
    File "C:\...
FileNotFoundError: [Errno 2] No such file or directory: 'test.txt'

def EncryptCode():
    ...
    try:
        ...
    except FileNotFoundError:
        return EncryptCode

我试过这样做：

Traceback (most recent call last):
    File "C:\...
FileNotFoundError: [Errno 2] No such file or directory: 'test.txt'

def EncryptCode():
    ...
    try:
        ...
    except FileNotFoundError:
        return EncryptCode

那怎么办

def EncryptCode():
    file_not_found = True
    while(file_not_found):
        try:
            encryptFileLoad = input("Name the file and directory you want to load with the ending '.txt':\n")
            file_not_found = False
        except FileNotFoundError:
            print('that didnt work! try again')
    with open (encryptFileLoad,mode="r",encoding="utf=8") as encrypt_file:
        encryptFile = encrypt_file.read()

你几乎成功了。检查它应该是这样的：

def EncryptCode():
    try:
        encryptFileLoad = input("Name the file and directory you want to load with the ending '.txt':\n")
        with open(encryptFileLoad,mode="r",encoding="utf=8") as encrypt_file:
            encryptFile = encrypt_file.read()
            return encryptFile
    except FileNotFoundError:
        print('File not found. Input correct filename')
        return EncryptCode()

或者您可以使用

while

循环要求用户输入正确的文件名，如：

while True:
    try:
        encryptFileLoad = input("Name the file and directory you want to load with the ending '.txt':\n")
        with open (encryptFileLoad,mode="r",encoding="utf=8") as encrypt_file:
            encryptFile = encrypt_file.read()
        break
    except FileNotFoundError:
        print('File not found. Input correct filename')