--- a/Lib/subprocess.py	2009-10-12 08:45:58.000000000 +0200
+++ b/Lib/subprocess.py	2009-11-23 14:31:42.687994247 +0100
@@ -438,7 +438,7 @@
 
 
 def check_output(*popenargs, **kwargs):
-    """Run command with arguments and return its output as a byte string.
+    r"""Run command with arguments and return its output as a byte string.
 
     If the exit code was non-zero it raises a CalledProcessError.  The
     CalledProcessError object will have the return code in the returncode
@@ -447,15 +447,15 @@
     The arguments are the same as for the Popen constructor.  Example:
 
     >>> check_output(["ls", "-l", "/dev/null"])
-    'crw-rw-rw- 1 root root 1, 3 Oct 18  2007 /dev/null\n'
+    b'crw-rw-rw- 1 root root 1, 3 Oct 18  2007 /dev/null\n'
 
     The stdout argument is not allowed as it is used internally.
     To capture standard error in the result, use stderr=subprocess.STDOUT.
 
     >>> check_output(["/bin/sh", "-c",
-                      "ls -l non_existent_file ; exit 0"],
-                     stderr=subprocess.STDOUT)
-    'ls: non_existent_file: No such file or directory\n'
+    ...               "ls -l non_existent_file ; exit 0"],
+    ...               stderr=STDOUT)
+    b'ls: non_existent_file: No such file or directory\n'
     """
     if 'stdout' in kwargs:
         raise ValueError('stdout argument not allowed, it will be overridden.')