golden hour

/usr/lib/python3/dist-packages/DistUpgrade

File/Folder	Size	Actions
DistUpgradeApport.py	4.95 KB
DistUpgradeAptCdrom.py	12.39 KB
DistUpgradeCache.py	52.93 KB
DistUpgradeConfigParser.py	3.75 KB
DistUpgradeController.py	101.89 KB
DistUpgradeFetcher.py	5.87 KB
DistUpgradeFetcherCore.py	11.2 KB
DistUpgradeFetcherKDE.py	9.72 KB
DistUpgradeFetcherSelf.py	2.02 KB
DistUpgradeGettext.py	2.97 KB
DistUpgradeMain.py	9.1 KB
DistUpgradePatcher.py	3.92 KB
DistUpgradeQuirks.py	49.04 KB
DistUpgradeVersion.py	21 B
DistUpgradeView.py	16.43 KB
DistUpgradeViewGtk3.py	33.85 KB
DistUpgradeViewKDE.py	42.11 KB
DistUpgradeViewNonInteractive.py	13.54 KB
DistUpgradeViewText.py	12.53 KB
GtkProgress.py	3.93 KB
MetaRelease.py	17.06 KB
QUrlOpener.py	3.24 KB
ReleaseNotesViewer.py	7.48 KB
ReleaseNotesViewerWebkit.py	2.91 KB
SimpleGtk3builderApp.py	2.01 KB
SimpleGtkbuilderApp.py	1.99 KB
__init__.py	0 B
__pycache__	-
apt_btrfs_snapshot.py	9.64 KB
apt_clone.py	32.81 KB
dist-upgrade.py	129 B
distro.py	23.15 KB
telemetry.py	3.4 KB
utils.py	17.92 KB
xorg_fix_proprietary.py	3.99 KB

Edit: ReleaseNotesViewerWebkit.py

# ReleaseNotesViewer.py
# -*- Mode: Python; indent-tabs-mode: nil; tab-width: 4; coding: utf-8 -*-
#
#  Copyright (c) 2011 Canonical
#
#  Author: Michael Vogt <mvo@ubutnu.com>
#
#  This modul provides an inheritance of the Gtk.TextView that is
#  aware of http URLs and allows to open them in a browser.
#  It is based on the pygtk-demo "hypertext".
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation; either version 2 of the
#  License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
#  USA

from .ReleaseNotesViewer import open_url

from gi.repository import Gtk

webkit2 = False
try:
    import gi
    gi.require_version("WebKit2", "4.0")
    from gi.repository import WebKit2 as WebKit
    webkit2 = True
except ImportError:
    from gi.repository import WebKit

class ReleaseNotesViewerWebkit(WebKit.WebView):
    def __init__(self, notes_url):
        super(ReleaseNotesViewerWebkit, self).__init__()
        self.load_uri(notes_url)
        if webkit2:
            self.connect("decide-policy",
                         self._on_decide_policy)
        else:
            self.connect("navigation-policy-decision-requested",
                         self._on_navigation_policy_decision_requested)

def _on_navigation_policy_decision_requested(self, view, frame,
                                                 request, action, policy):
        open_url(request.get_uri())
        policy.ignore()
        return True

def _on_decide_policy(self, web_view, decision, decision_type):
        if decision_type == WebKit.PolicyDecisionType.NAVIGATION_ACTION:
            navigation_action = decision.get_navigation_action()
            navigation_request = navigation_action.get_request()
            navigation_type = navigation_action.get_navigation_type()

if navigation_type == WebKit.NavigationType.LINK_CLICKED:
                uri = navigation_request.get_uri()
                open_url(uri)
                decision.ignore()
                return True

return False

if __name__ == "__main__":
    win = Gtk.Window()
    win.set_size_request(600, 400)
    scroll = Gtk.ScrolledWindow()
    rv = ReleaseNotesViewerWebkit("http://archive.ubuntu.com/ubuntu/dists/"
                                  "devel/main/dist-upgrader-all/current/"
                                  "ReleaseAnnouncement.html")
    scroll.add(rv)
    win.add(scroll)
    win.show_all()
    Gtk.main()