Fixed Python flake8 offenses
diff --git a/lib/py/src/transport/THttpClient.py b/lib/py/src/transport/THttpClient.py
index 6281165..7d0b0fb 100644
--- a/lib/py/src/transport/THttpClient.py
+++ b/lib/py/src/transport/THttpClient.py
@@ -102,7 +102,7 @@
         ap = "%s:%s" % (urllib.parse.unquote(proxy.username),
                         urllib.parse.unquote(proxy.password))
         cr = base64.b64encode(ap.encode()).strip()
-        return "Basic " + six.ensure_str(cr)
+        return "Basic " + cr.decode("ascii")
 
     def using_proxy(self):
         return self.realhost is not None