Install Python deps in Docker image.
diff --git a/tools/run_tests/jenkins.sh b/tools/run_tests/jenkins.sh
index c0d02dd..1d192aa 100755
--- a/tools/run_tests/jenkins.sh
+++ b/tools/run_tests/jenkins.sh
@@ -26,5 +26,10 @@
 # Other tests are run in parallel.  The overall run fails if any one of them
 # fails.
 
-# java_jdk6
-parallel $TEST_SCRIPT ::: java_jdk7 javanano_jdk7
+parallel $TEST_SCRIPT ::: \
+  java_jdk7 \
+  javanano_jdk7 \
+  python \
+  python_cpp
+
+# java_jdk6 \
diff --git a/tools/run_tests/tests.sh b/tools/run_tests/tests.sh
index db49975..5281cd2 100755
--- a/tools/run_tests/tests.sh
+++ b/tools/run_tests/tests.sh
@@ -152,6 +152,9 @@
 }
 
 internal_install_python_deps() {
+  if [ "$TRAVIS" != "true" ]; then
+    return;
+  fi
   # Install tox (OS X doesn't have pip).
   if [ $(uname -s) == "Darwin" ]; then
     sudo easy_install tox