How to use the picard.file.File function in picard

def create_test_files():
    test_images = [
        CoverArtImage(url='file://file1', data=create_fake_png(b'a')),
        CoverArtImage(url='file://file2', data=create_fake_png(b'b')),
    ]
    test_files = [
        File('test1.flac'),
        File('test2.flac'),
        File('test2.flac')
    ]
    test_files[0].metadata.images.append(test_images[0])
    test_files[1].metadata.images.append(test_images[1])
    test_files[2].metadata.images.append(test_images[1])
    test_files[0].orig_metadata.images.append(test_images[0])
    test_files[1].orig_metadata.images.append(test_images[1])
    test_files[2].orig_metadata.images.append(test_images[1])
    return (test_images, test_files)

try:
            term = spec._encodings[frame.encoding][1]
        except AttributeError:
            term = spec.encodings[frame.encoding][1]
        if data.endswith(term):
            data = data[:-len(term)]
    return data
id3.MultiSpec._write_orig = id3.MultiSpec.write
id3.MultiSpec.write = patched_MultiSpec_write


id3.TCMP = compatid3_dsf.TCMP
id3.TSO2 = compatid3_dsf.TSO2


class ID3File_DSF(File):
    """Generic ID3-based file."""
    _File = None
    _IsMP3 = False

    __upgrade = {
        'XSOP': 'TSOP',
        'TXXX:ALBUMARTISTSORT': 'TSO2',
    }

    __translate = {
        'TPE1': 'artist',
        'TPE2': 'albumartist',
        'TPE3': 'conductor',
        'TPE4': 'remixer',
        'TCOM': 'composer',
        'TCON': 'genre',

def callback(self, objs):
        for obj in objs:
            if isinstance(obj, Track):
                for file_ in obj.linked_files:
                    self._add_file_to_queue(file_)
            elif isinstance(obj, File):
                self._add_file_to_queue(obj)

def example_1(self):
        file = File("ticket_to_ride.mp3")
        file.state = File.NORMAL
        file.metadata['album'] = 'Help!'
        file.metadata['title'] = 'Ticket to Ride'
        file.metadata['artist'] = 'The Beatles'
        file.metadata['artistsort'] = 'Beatles, The'
        file.metadata['albumartist'] = 'The Beatles'
        file.metadata['albumartistsort'] = 'Beatles, The'
        file.metadata['tracknumber'] = '7'
        file.metadata['totaltracks'] = '14'
        file.metadata['discnumber'] = '1'
        file.metadata['totaldiscs'] = '1'
        file.metadata['date'] = '1965-08-06'
        file.metadata['releasetype'] = ['album', 'soundtrack']
        file.metadata['~primaryreleasetype'] = ['album']
        file.metadata['~secondaryreleasetype'] = ['soundtrack']
        file.metadata['releasestatus'] = 'official'

if not (new_values or clear_existing_tags
                        or name in new_metadata.deleted_tags):
                    continue
                orig_values = self.orig_metadata.getall(name)
                if orig_values != new_values:
                    self.similarity = self.orig_metadata.compare(new_metadata, ignored_tags)
                    if self.state == File.NORMAL:
                        self.state = File.CHANGED
                    break
        else:
            if (self.metadata.images
                    and self.orig_metadata.images != self.metadata.images):
                self.state = File.CHANGED
            else:
                self.similarity = 1.0
                if self.state == File.CHANGED:
                    self.state = File.NORMAL
        if signal:
            log.debug("Updating file %r", self)
            self.update_item()

def analyze(self, objs):
        """Analyze the file(s)."""
        if not self.use_acoustid:
            return
        files = self.get_files_from_objects(objs)
        for file in files:
            file.set_pending()
            self._acoustid.analyze(file, partial(file._lookup_finished,
                                                 File.LOOKUP_ACOUSTID))

self.update_actions()

        metadata = None
        orig_metadata = None
        obj = None

        # Clear any existing status bar messages
        self.set_statusbar_message("")

        if self.player:
            self.player.set_objects(self.selected_objects)

        if len(objects) == 1:
            obj = list(objects)[0]
            if isinstance(obj, File):
                metadata = obj.metadata
                orig_metadata = obj.orig_metadata
                if obj.state == obj.ERROR:
                    msg = N_("%(filename)s (error: %(error)s)")
                    mparms = {
                        'filename': obj.filename,
                        'error': obj.error
                    }
                else:
                    msg = N_("%(filename)s")
                    mparms = {
                        'filename': obj.filename,
                    }
                self.set_statusbar_message(msg, mparms, echo=None, history=None)
            elif isinstance(obj, Track):
                metadata = obj.metadata

super().__init__(parent)
        self.window = window
        self.create_icons()
        self.views = [FileTreeView(window, self), AlbumTreeView(window, self)]
        self.views[0].itemSelectionChanged.connect(self.update_selection_0)
        self.views[1].itemSelectionChanged.connect(self.update_selection_1)
        self._selected_view = 0
        self._ignore_selection_changes = False

        TreeItem.window = window
        TreeItem.base_color = self.palette().base().color()
        TreeItem.text_color = self.palette().text().color()
        TreeItem.text_color_secondary = self.palette() \
            .brush(QtGui.QPalette.Disabled, QtGui.QPalette.Text).color()
        TrackItem.track_colors = defaultdict(lambda: TreeItem.text_color, {
            File.NORMAL: interface_colors.get_qcolor('entity_saved'),
            File.CHANGED: TreeItem.text_color,
            File.PENDING: interface_colors.get_qcolor('entity_pending'),
            File.ERROR: interface_colors.get_qcolor('entity_error'),
        })
        FileItem.file_colors = defaultdict(lambda: TreeItem.text_color, {
            File.NORMAL: TreeItem.text_color,
            File.CHANGED: TreeItem.text_color,
            File.PENDING: interface_colors.get_qcolor('entity_pending'),
            File.ERROR: interface_colors.get_qcolor('entity_error'),
        })

def __init__(self, obj, parent=None):
        super().__init__(parent)
        self.obj = obj
        self.images = []
        self.existing_images = []
        self.ui = Ui_InfoDialog()
        self.display_existing_artwork = False

        if (isinstance(obj, File)
                and isinstance(obj.parent, Track)
                or isinstance(obj, Track)
                or (isinstance(obj, Album) and obj.get_num_total_files() > 0)):
            # Display existing artwork only if selected object is track object
            # or linked to a track object or it's an album with files
            if (getattr(obj, 'orig_metadata', None) is not None
                    and obj.orig_metadata.images
                    and obj.orig_metadata.images != obj.metadata.images):
                self.display_existing_artwork = True
                self.existing_images = obj.orig_metadata.images

        if obj.metadata.images:
            self.images = obj.metadata.images
        if not self.images and self.existing_images:
            self.images = self.existing_images
            self.existing_images = []

def __init__(self, row):
        File.__init__(self, unicode(row[6], 'utf-8', 'replace'))
        self.orig_metadata["title"] = row[0].decode('utf-8', 'replace')
        self.orig_metadata["artist"] = row[1].decode('utf-8', 'replace')
        self.orig_metadata["date"] = row[2].decode('utf-8', 'replace')
        self.orig_metadata["album"] = row[3].decode('utf-8', 'replace')
        self.orig_metadata["tracknumber"] = row[4].decode('utf-8', 'replace')
        self.orig_metadata["~filename"] = self.base_filename
        self.orig_metadata["~#length"] = int(row[5])
        self.metadata.copy(self.orig_metadata)