diff --git a/.travis.yml b/.travis.yml
index 343b29c5..14ea2d9a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,7 +30,7 @@ script:
 after_success:
 - export TAG=`if [ "$TRAVIS_BRANCH" == "master" ]; then echo "latest"; else echo $TRAVIS_BRANCH; fi`
 - |
-  if [ "$TRAVIS_REPO_SLUG" == "alxchk/pupy" ] && [ -z "$TRAVIS_PULL_REQUEST_SLUG" ]; then
+  if [ "$TRAVIS_REPO_SLUG" = "alxchk/pupy" ] && [ -z "$TRAVIS_PULL_REQUEST_SLUG" ]; then
   docker login -u $DOCKER_USER -p $DOCKER_PASS &&
   cd $TRAVIS_BUILD_DIR/pupy &&
   docker push alxchk/pupy:$TAG >/dev/null;
diff --git a/pupy/network/lib/connection.py b/pupy/network/lib/connection.py
index 7192f969..bd85b541 100644
--- a/pupy/network/lib/connection.py
+++ b/pupy/network/lib/connection.py
@@ -7,7 +7,7 @@ import time
 import traceback
 
 from rpyc.core import Connection, consts, brine
-from threading import Thread, Event, Lock, RLock, current_thread
+from threading import Thread, Lock, current_thread
 from Queue import Queue, Full, Empty
 
 from network.lib import getLogger
@@ -30,24 +30,24 @@ def stream_dump(obj):
 
 @brine.register(brine._dump_registry, str)
 def _dump_str_to_buffer(obj, stream):
-    l = len(obj)
-    if l == 0:
+    obj_len = len(obj)
+    if obj_len == 0:
         stream.append(brine.TAG_EMPTY_STR)
         return
-    elif l < 5:
-        if l == 1:
+    elif obj_len < 5:
+        if obj_len == 1:
             stream.append(brine.TAG_STR1)
-        elif l == 2:
+        elif obj_len == 2:
             stream.append(brine.TAG_STR2)
-        elif l == 3:
+        elif obj_len == 3:
             stream.append(brine.TAG_STR3)
-        elif l == 4:
+        elif obj_len == 4:
             stream.append(brine.TAG_STR4)
     else:
-        if l < 256:
-            stream.append(brine.TAG_STR_L1 + brine.I1.pack(l))
+        if obj_len < 256:
+            stream.append(brine.TAG_STR_L1 + brine.I1.pack(obj_len))
         else:
-            stream.append(brine.TAG_STR_L4 + brine.I4.pack(l))
+            stream.append(brine.TAG_STR_L4 + brine.I4.pack(obj_len))
 
     stream.append(obj)