diff --git a/debian/changelog b/debian/changelog
index 4383ead..f961c88 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,13 @@
+ubuntu-dev-tools (0.170) UNRELEASED; urgency=medium
+
+  [ Robie Basak ]
+  * pull-debian-source:
+    + Add a new --no-verify-signature option option, to download a source
+      package without checking its signature.
+    + Port to Python 3.
+
+ -- Mattia Rizzolo <mattia@debian.org>  Sat, 20 Jul 2019 15:09:05 +0200
+
 ubuntu-dev-tools (0.169) unstable; urgency=medium
 
   [ Colin Watson ]
diff --git a/pull-debian-source b/pull-debian-source
index d4e0519..6bfc5fb 100755
--- a/pull-debian-source
+++ b/pull-debian-source
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # pull-debian-source -- pull a source package from Launchpad
 # Copyright (C) 2011, Stefano Rivera <stefanor@ubuntu.com>
@@ -19,7 +19,8 @@
 import json
 import optparse
 import sys
-import urllib2
+import urllib.request
+import urllib.error
 
 from distro_info import DebianDistroInfo, DistroDataOutdated
 
@@ -54,17 +55,17 @@ def source_package_for(binary, release):
     """Query DDE to find the source package for a particular binary"""
     try:
         release = DebianDistroInfo().codename(release, default=release)
-    except DistroDataOutdated, e:
+    except DistroDataOutdated as e:
         Logger.warn(e)
     url = ('http://dde.debian.net/dde/q/udd/dist/d:debian/r:%s/p:%s/?t=json'
            % (release, binary))
     data = None
     try:
-        data = json.load(urllib2.urlopen(url))['r']
-    except urllib2.URLError, e:
+        data = json.load(urllib.request.urlopen(url))['r']
+    except urllib.error.URLError as e:
         Logger.error('Unable to retrieve package information from DDE: '
                      '%s (%s)', url, str(e))
-    except ValueError, e:
+    except ValueError as e:
         Logger.error('Unable to parse JSON response from DDE: '
                      '%s (%s)', url, str(e))
     if not data:
@@ -89,6 +90,10 @@ def main():
     parser.add_option('--no-conf',
                       dest='no_conf', default=False, action='store_true',
                       help="Don't read config files or environment variables")
+    parser.add_option('--no-verify-signature',
+                      dest='verify_signature', default=True,
+                      action='store_false',
+                      help="Allow signature verification failure")
     (options, args) = parser.parse_args()
     if not args:
         parser.error('Must specify package name')
@@ -128,8 +133,8 @@ def main():
                                  mirrors=[options.debian_mirror,
                                           options.debsec_mirror])
     try:
-        srcpkg.pull()
-    except DownloadError, e:
+        srcpkg.pull(verify_signature=options.verify_signature)
+    except DownloadError as e:
         Logger.error('Failed to download: %s', str(e))
         sys.exit(1)
     if not options.download_only:
diff --git a/ubuntutools/archive.py b/ubuntutools/archive.py
index 9324313..0e6e219 100644
--- a/ubuntutools/archive.py
+++ b/ubuntutools/archive.py
@@ -303,10 +303,10 @@ class SourcePackage(object):
         else:
             Logger.info(message)
 
-    def _write_dsc(self):
+    def _write_dsc(self, verify_signature=True):
         "Write dsc file to workdir"
         if self._dsc is None:
-            self.pull_dsc()
+            self.pull_dsc(verify_signature=verify_signature)
         with open(self.dsc_pathname, 'wb') as f:
             f.write(self.dsc.raw_text)
 
@@ -359,9 +359,9 @@ class SourcePackage(object):
             return False
         return True
 
-    def pull(self):
+    def pull(self, verify_signature=True):
         "Pull into workdir"
-        self._write_dsc()
+        self._write_dsc(verify_signature=verify_signature)
         for entry in self.dsc['Files']:
             name = entry['name']
             for url in self._source_urls(name):
@@ -471,7 +471,7 @@ class DebianSourcePackage(SourcePackage):
         if self.snapshot_list:
             yield self._snapshot_url(name)
 
-    def pull_dsc(self):
+    def pull_dsc(self, verify_signature=True):
         "Retrieve dscfile and parse"
         try:
             super(DebianSourcePackage, self).pull_dsc()
@@ -489,7 +489,7 @@ class DebianSourcePackage(SourcePackage):
             break
         else:
             raise DownloadError('dsc could not be found anywhere')
-        self._check_dsc(verify_signature=True)
+        self._check_dsc(verify_signature=verify_signature)
 
     # Local methods:
     @property
@@ -636,7 +636,7 @@ def rmadison(url, package, suite=None, arch=None):
 
     # pylint bug: http://www.logilab.org/ticket/46273
     # pylint: disable=E1103
-    for line in output.strip().splitlines():
+    for line in output.decode().strip().splitlines():
         # pylint: enable=E1103
         pkg, ver, dist, archs = [x.strip() for x in line.split('|')]
         comp = 'main'