Python io.UnsupportedOperation() Examples

def read(self, *files, **params):
        """ Read and parse INI files.

        :param *files: Files for reading
        :param **params: Params for parsing

        Set `update=False` for prevent values redefinition.

        """
        for f in files:
            try:
                with io.open(f, encoding='utf-8') as ff:
                    NS_LOGGER.info('Read from `{0}`'.format(ff.name))
                    self.parse(ff.read(), **params)
            except (IOError, TypeError, SyntaxError, io.UnsupportedOperation):
                if not self.silent_read:
                    NS_LOGGER.error('Reading error `{0}`'.format(ff.name))
                    raise 

def write(self, string):  # type: (str) -> None
        """
        Writes a string to the stream.
        """
        if self.is_closed():
            raise io.UnsupportedOperation("Cannot write to a closed input.")

        self._stream.write(string)
        self._stream.flush() 

def seek_stream(self, seek_pos):
        """Move position of bstream to seek_pos"""
        try:
            self.bstream[0].seek(seek_pos)
            self.bstream[1] = seek_pos
            return

        except UnsupportedOperation:
            chunksize = 4 * 1024**2

            if seek_pos >= self.bstream[1]:
                while seek_pos - self.bstream[1] > chunksize:
                    self.read_stream(chunksize)
                self.read_stream(seek_pos - self.bstream[1])
                return

            self.bstream[0].close()
            self.bstream[1] = 0
            self.bstream = self.get_bstream(self.imgpath)

            while seek_pos - self.bstream[1] > chunksize:
                self.read_stream(chunksize)
            self.read_stream(seek_pos - self.bstream[1])

            return 

def super_len(o):
    if hasattr(o, '__len__'):
        return len(o)

    if hasattr(o, 'len'):
        return o.len

    if hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            return os.fstat(fileno).st_size

    if hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        return len(o.getvalue()) 

def super_len(o):
    if hasattr(o, '__len__'):
        return len(o)

    if hasattr(o, 'len'):
        return o.len

    if hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            return os.fstat(fileno).st_size

    if hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        return len(o.getvalue()) 

def super_len(o):
    if hasattr(o, '__len__'):
        return len(o)

    if hasattr(o, 'len'):
        return o.len

    if hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            return os.fstat(fileno).st_size

    if hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        return len(o.getvalue()) 

def super_len(o):
    if hasattr(o, '__len__'):
        return len(o)

    if hasattr(o, 'len'):
        return o.len

    if hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            return os.fstat(fileno).st_size

    if hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        return len(o.getvalue()) 

def super_len(o):
    if hasattr(o, '__len__'):
        return len(o)

    if hasattr(o, 'len'):
        return o.len

    if hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            return os.fstat(fileno).st_size

    if hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        return len(o.getvalue()) 

def super_len(o):
    if hasattr(o, '__len__'):
        return len(o)

    if hasattr(o, 'len'):
        return o.len

    if hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            return os.fstat(fileno).st_size

    if hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        return len(o.getvalue()) 

def seek(self, offset: int, whence: int = io.SEEK_SET) -> int:
        self._check_open()
        self._check_random()
        if whence == io.SEEK_SET:
            ok = self.dev.seek(offset)
        elif whence == io.SEEK_CUR:
            ok = self.dev.seek(self.tell() + offset)
        elif whence == io.SEEK_END:
            ok = self.dev.seek(len(self) + offset)
        else:
            raise io.UnsupportedOperation("whence = {} is not "
                                          "supported!".format(whence))
        if not ok:
            raise QtOSError(self.dev, msg="seek failed!")

        return self.dev.pos() 

def chunks(self, chunk_size=None):
        """
        Read the file and yield chunks of ``chunk_size`` bytes (defaults to
        ``UploadedFile.DEFAULT_CHUNK_SIZE``).
        """
        if not chunk_size:
            chunk_size = self.DEFAULT_CHUNK_SIZE

        try:
            self.seek(0)
        except (AttributeError, UnsupportedOperation):
            pass

        while True:
            data = self.read(chunk_size)
            if not data:
                break
            yield data 

def read(self, size=-1):
        if not self.readable:
            raise io.UnsupportedOperation("File not open for reading.")
        return self.__io_buffer.read(size) 

def detach(self):
        raise io.UnsupportedOperation() 

def super_len(o):
    total_length = 0
    current_position = 0

    if hasattr(o, '__len__'):
        total_length = len(o)

    elif hasattr(o, 'len'):
        total_length = o.len

    elif hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        total_length = len(o.getvalue())

    elif hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            total_length = os.fstat(fileno).st_size

            # Having used fstat to determine the file length, we need to
            # confirm that this file was opened up in binary mode.
            if 'b' not in o.mode:
                warnings.warn((
                    "Requests has determined the content-length for this "
                    "request using the binary size of the file: however, the "
                    "file has been opened in text mode (i.e. without the 'b' "
                    "flag in the mode). This may lead to an incorrect "
                    "content-length. In Requests 3.0, support will be removed "
                    "for files in text mode."),
                    FileModeWarning
                )

    if hasattr(o, 'tell'):
        current_position = o.tell()

    return max(0, total_length - current_position) 

def has_fileno(obj):
    if not hasattr(obj, "fileno"):
        return False

    # check BytesIO case and maybe others
    try:
        obj.fileno()
    except (AttributeError, IOError, io.UnsupportedOperation):
        return False

    return True 

def super_len(o):
    total_length = 0
    current_position = 0

    if hasattr(o, '__len__'):
        total_length = len(o)

    elif hasattr(o, 'len'):
        total_length = o.len

    elif hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        total_length = len(o.getvalue())

    elif hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            total_length = os.fstat(fileno).st_size

            # Having used fstat to determine the file length, we need to
            # confirm that this file was opened up in binary mode.
            if 'b' not in o.mode:
                warnings.warn((
                    "Requests has determined the content-length for this "
                    "request using the binary size of the file: however, the "
                    "file has been opened in text mode (i.e. without the 'b' "
                    "flag in the mode). This may lead to an incorrect "
                    "content-length. In Requests 3.0, support will be removed "
                    "for files in text mode."),
                    FileModeWarning
                )

    if hasattr(o, 'tell'):
        current_position = o.tell()

    return max(0, total_length - current_position) 

def readable(self):
        """Return a bool indicating whether object was opened for reading.

        If False, read() will raise UnsupportedOperation.
        """
        return False 

def test_seek_unsupported(self, pyqiodev):
        """Test seeking with unsupported whence arguments."""
        # pylint: disable=no-member,useless-suppression
        if hasattr(os, 'SEEK_HOLE'):
            whence = os.SEEK_HOLE
        elif hasattr(os, 'SEEK_DATA'):
            whence = os.SEEK_DATA
        # pylint: enable=no-member,useless-suppression
        else:
            pytest.skip("Needs os.SEEK_HOLE or os.SEEK_DATA available.")
        pyqiodev.open(QIODevice.ReadOnly)
        with pytest.raises(io.UnsupportedOperation):
            pyqiodev.seek(0, whence) 

def readline(self, size=-1):
        if not self.readable:
            raise io.UnsupportedOperation("File not open for reading.")
        return self.__io_buffer.readline(size) 

def readlines(self, hint=-1):
        if not self.readable:
            raise io.UnsupportedOperation("File not open for reading.")
        return self.__io_buffer.readlines(hint) 

def write(self, s):
        if not self.writable:
            raise io.UnsupportedOperation("File not open for writing.")
        self.__io_buffer.write(s)
        self.__modified = True 

def super_len(o):
    total_length = 0
    current_position = 0

    if hasattr(o, '__len__'):
        total_length = len(o)

    elif hasattr(o, 'len'):
        total_length = o.len

    elif hasattr(o, 'getvalue'):
        # e.g. BytesIO, cStringIO.StringIO
        total_length = len(o.getvalue())

    elif hasattr(o, 'fileno'):
        try:
            fileno = o.fileno()
        except io.UnsupportedOperation:
            pass
        else:
            total_length = os.fstat(fileno).st_size

            # Having used fstat to determine the file length, we need to
            # confirm that this file was opened up in binary mode.
            if 'b' not in o.mode:
                warnings.warn((
                    "Requests has determined the content-length for this "
                    "request using the binary size of the file: however, the "
                    "file has been opened in text mode (i.e. without the 'b' "
                    "flag in the mode). This may lead to an incorrect "
                    "content-length. In Requests 3.0, support will be removed "
                    "for files in text mode."),
                    FileModeWarning
                )

    if hasattr(o, 'tell'):
        current_position = o.tell()

    return max(0, total_length - current_position) 

def fileno(self):
        raise UnsupportedOperation("redirected stdin is pseudofile, has no fileno()") 

def _get_stderr_fileno():
    try:
        return sys.stderr.fileno()
    except (AttributeError, io.UnsupportedOperation):
        # python-xdist monkeypatches sys.stderr with an object that is not an actual file.
        # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
        # This is potentially dangerous, but the best we can do.
        return sys.__stderr__.fileno() 

def fileno(self):
        raise UnsupportedOperation("redirected stdin is pseudofile, has no fileno()") 

def _get_stderr_fileno():
    try:
        return sys.stderr.fileno()
    except (AttributeError, io.UnsupportedOperation):
        # python-xdist monkeypatches sys.stderr with an object that is not an actual file.
        # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
        # This is potentially dangerous, but the best we can do.
        return sys.__stderr__.fileno() 

def test_detach(self):
        buf = self.ioclass()
        self.assertRaises(self.UnsupportedOperation, buf.detach) 

def test_unseekable(self):
        with open(TESTFN, 'wb') as stream:
            stream.write(self.testdata)
        with UnseekableIO(TESTFN, 'rb') as stream:
            with self.assertRaises(io.UnsupportedOperation):
                imghdr.what(stream) 

def is_decorated():
    if platform.system().lower() == "windows":
        return (
            os.getenv("ANSICON") is not None
            or "ON" == os.getenv("ConEmuANSI")
            or "xterm" == os.getenv("Term")
        )

    if not hasattr(sys.stdout, "fileno"):
        return False

    try:
        return os.isatty(sys.stdout.fileno())
    except UnsupportedOperation:
        return False 

def is_interactive():
    if not hasattr(sys.stdin, "fileno"):
        return False

    try:
        return os.isatty(sys.stdin.fileno())
    except UnsupportedOperation:
        return False