尝试使用用户输入时除外

Question

以下是我的问题的示例。我有一个试图访问 excel 文件的脚本。它工作正常，但如果文件当前打开，我会收到权限被拒绝错误。我通常会关闭文件并再次运行脚本，但我希望能够关闭程序并只需输入击键，例如“y”，以指示文件已关闭并重试。我现在的问题是，当我输入任何值时，它仍会继续尝试运行，如果再次失败，它将退出脚本。有什么想法吗？

input_yes = 'y'
answer = {}
try:
    finalSheet('my file.xlsx')
except:
    while answer != str(input_yes):
         answer = input('Please confirm that (my file.xlsx) is closed and enter y: ')
         finalSheet('my file.xlsx')
         continue

Answer 1

input_yes = 'y'
while True:
    try:
        finalSheet('my file.xlsx')
        break #If reading the file succeeded, it will leave the outer loop
    except:
        while True:
            answer = input('Please confirm that (my file.xlsx) is closed and enter y: ')
            if answer == input_yes:
                break #If the answer is 'y', it will leave the inner loop, and try to read the file. Otherwise, it will continue to ask for readiness

Answer 2

我不会真正用 python 编程，但在大多数语言中，异常处理块不被视为 try 块的一部分，否则您将无法从中重新抛出异常。

您需要更改代码，以便整个事情在一个循环中。

success = False

while not success:
    try:
        finalSheet('my file.xlsx')
        success = True
    except:
        # We actually don't care what the answer is. You could bail if the 
        # answer is no I guess
        answer = input('Please confirm that (my file.xlsx) is closed and enter y: ')

对于上面的任何错误，我的 Python 不是很好。

Answer 3

try:
    while True:
        try:
            finalSheet('my file.xlsx')
            print('Success')
            break
        except:
            if not input('Please confirm that (my file.xlsx) is closed and enter y: ') == str(input_yes):
                raise KeyboardInterrupt #or any other exception
except KeyboardInterrupt:
    print('Cancelled by user')
    return

您想将整个块放在“尝试”中。 如果操作成功，循环将中断，跳过外部的“except”块。

如果出现异常（即文件被锁定）并且用户回答“y”，则循环继续。

如果文件被锁定并且用户回答 !"y" 则引发新异常，退出循环进入最后一个 "except" 块。