将文件转换为 Ascii 抛出异常

后果我之前的问题 https://stackoverflow.com/questions/31742609/how-to-strip-the-leading-unciode-characters-from-a-file/31742694?noredirect=1#comment51595470_31742694，我已经编码了：

def ConvertFileToAscii(args, filePath):
    try:
       # Firstly, make sure that the file is writable by all, otherwise we can't update it
        os.chmod(filePath, 0o666)

        with open(filePath, "rb") as file:
            contentOfFile = file.read()

        unicodeData = contentOfFile.decode("utf-8")
        asciiData = unicodeData.encode("ascii", "ignore")

        asciiData = unicodedata.normalize('NFKD', unicodeData).encode('ASCII', 'ignore')

        temporaryFile = tempfile.NamedTemporaryFile(mode='wt', delete=False)
        temporaryFileName = temporaryFile.name

        with open(temporaryFileName, 'wb')  as file:
            file.write(asciiData)

        if ((args.info) or (args.diagnostics)):
            print(filePath + ' converted to ASCII and stored in ' + temporaryFileName)


        return temporaryFileName

    #
    except KeyboardInterrupt:
        raise

    except Exception as e:
        print('!!!!!!!!!!!!!!!\nException while trying to convert ' + filePath + ' to ASCII')
        print(e)
        exc_type, exc_value, exc_traceback = sys.exc_info()
        print(traceback.format_exception(exc_type, exc_value, exc_traceback))

        if args.break_on_error:
            sys.exit('Break on error\n')

当我运行它时，我收到如下异常：

['Traceback (most recent call last):
', '  File "/home/ker4hi/tools/xmlExpand/xmlExpand.py", line 99, in ConvertFileToAscii
    unicodeData = contentOfFile.decode("utf-8")
    ', "UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf6 in position 1081: invalid start byte"]

我究竟做错了什么？

我真的不关心将它们转换为 ASCII 时的数据丢失。

ox9C 是Ü带有变音符号 (Umlaut) 的 U，没有它我也能生活。

如何将此类文件转换为仅包含纯 Ascii 字符？我真的需要将它们作为二进制打开并检查每个字节吗？

Use:

contentOfFile.decode('utf-8', 'ignore')

例外是来自decode阶段，您没有忽略错误。