debian/changelog

+python-xopen (0.5.0-2) unstable; urgency=medium
+
+  * Add missing Depends
+    Closes: #921553
+
+ -- Andreas Tille <tille@debian.org>  Wed, 06 Feb 2019 22:26:09 +0100
+
 python-xopen (0.5.0-1) unstable; urgency=medium
 
   * New upstream version

debian/control

@@ -26,7 +26,9 @@ Homepage: https://github.com/marcelm/xopen
 Package: python-xopen
 Architecture: all
 Depends: ${python:Depends},
-         ${misc:Depends}
+         ${misc:Depends},
+         python-pkg-resources,
+         python-bz2file
 Provides: ${python:Provides}
 Description: Python module to open compressed files transparently
  This small Python module provides a xopen function that works like the
@@ -47,7 +49,8 @@ Description: Python module to open compressed files transparently
 Package: python3-xopen
 Architecture: all
 Depends: ${python3:Depends},
-         ${misc:Depends}
+         ${misc:Depends},
+         python3-pkg-resources
 Description: Python3 module to open compressed files transparently
  This small Python3 module provides a xopen function that works like the
  built-in open function, but can also deal with compressed files.