diff -r 811ccdee6f87 Lib/test/test_pipes.py
--- a/Lib/test/test_pipes.py	Wed May 04 09:44:44 2016 +0300
+++ b/Lib/test/test_pipes.py	Thu May 05 09:58:33 2016 +0200
@@ -1,5 +1,6 @@
 import pipes
 import os
+import sys
 import string
 import unittest
 from test.support import TESTFN, run_unittest, unlink, reap_children
@@ -9,8 +10,9 @@
 
 TESTFN2 = TESTFN + "2"
 
-# tr a-z A-Z is not portable, so make the ranges explicit
-s_command = 'tr %s %s' % (string.ascii_lowercase, string.ascii_uppercase)
+# A filter command to swap the case.
+s_command = (("%s -c \"import sys; exec('for s in sys.stdin.read(): "
+              "sys.stdout.write(s.swapcase())')\"") % sys.executable)
 
 class SimplePipeTests(unittest.TestCase):
     def tearDown(self):