Port simplechanges to python 3

packaging/deb/simplechanges

@@ -17,6 +17,8 @@ from tempfile import mkdtemp
 
 logger = logging.getLogger('simplechanges')
 
+PY2 = sys.version_info < (3,)
+
 
 @contextmanager
 def tmpdir():
@@ -103,10 +105,16 @@ def generate_changes(controls, filename, filesize, md5, sha1, sha256):
         k: v for k, v in controls.items()
         if k in {'Architecture', 'Description', 'Maintainer', 'Version'}
     })
-    changes['Changed-By'] = u"%s <%s>" % (
-        os.environ['DEBFULLNAME'].decode('utf-8'),
-        os.environ['DEBEMAIL'].decode('utf-8'),
-    )
+    if PY2:
+        changes['Changed-By'] = u"%s <%s>" % (
+            os.environ['DEBFULLNAME'].decode('utf-8'),
+            os.environ['DEBEMAIL'].decode('utf-8'),
+        )
+    else:
+        changes['Changed-By'] = u"%s <%s>" % (
+            os.environ['DEBFULLNAME'],
+            os.environ['DEBEMAIL'],
+        )
     changes['Changes'] = CHANGELOG_FMT % changes
     changes['Files'] = [u' '.join([
         md5,
@@ -144,7 +152,9 @@ def main():
         )
 
     for payload in format(changes):
-        sys.stdout.write(payload.encode('utf-8'))
+        if PY2:
+            payload = payload.encode('UTF-8')
+        sys.stdout.write(payload)
     logger.info(".changes generated for %s.", deb)
 
     sys.exit(0)