Index: lldb/packages/Python/lldbsuite/test/tools/lldb-server/socket_packet_pump.py
===================================================================
--- lldb/packages/Python/lldbsuite/test/tools/lldb-server/socket_packet_pump.py
+++ lldb/packages/Python/lldbsuite/test/tools/lldb-server/socket_packet_pump.py
@@ -7,6 +7,7 @@
 import threading
 import traceback
 import codecs
+import sys
 
 from six.moves import queue
 from lldbsuite.support import seven
@@ -25,7 +26,11 @@
 
 def _dump_queue(the_queue):
     while not the_queue.empty():
-        print(codecs.encode(the_queue.get(True), "string_escape"))
+        # 'string_escape' is only avilable in Python 2.
+        if sys.version_info.major == 2:
+            print(codecs.encode(the_queue.get(True), "string_escape"))
+        else:
+            print(codecs.encode(the_queue.get(True), "unicode_escape"))
         print("\n")