debian/changelog

+tnseq-transit (2.2.1-2) unstable; urgency=medium
+
+  * Add dh_python to Build-Depends
+    Closes: #909759
+
+ -- Andreas Tille <tille@debian.org>  Fri, 28 Sep 2018 07:54:04 +0200
+
 tnseq-transit (2.2.1-1) unstable; urgency=medium
 
   * New upstream version

debian/control

@@ -4,6 +4,7 @@ Uploaders: Andreas Tille <tille@debian.org>
 Section: science
 Priority: optional
 Build-Depends: debhelper (>= 11~),
+               dh-python,
                python-all-dev,
                python-setuptools
 Standards-Version: 4.2.1