Index: Lib/subprocess.py
===================================================================
--- Lib/subprocess.py	(révision 66888)
+++ Lib/subprocess.py	(copie de travail)
@@ -612,15 +612,15 @@
         if bufsize == 0:
             bufsize = 1  # Nearly unbuffered (XXX for now)
         if p2cwrite is not None:
-            self.stdin = io.open(p2cwrite, 'wb', bufsize)
+            self.stdin = io.open(p2cwrite, 'wb', buffering=bufsize)
             if self.universal_newlines:
                 self.stdin = io.TextIOWrapper(self.stdin)
         if c2pread is not None:
-            self.stdout = io.open(c2pread, 'rb', bufsize)
+            self.stdout = io.open(c2pread, 'rb', buffering=bufsize)
             if universal_newlines:
                 self.stdout = io.TextIOWrapper(self.stdout)
         if errread is not None:
-            self.stderr = io.open(errread, 'rb', bufsize)
+            self.stderr = io.open(errread, 'rb', buffering=bufsize)
             if universal_newlines:
                 self.stderr = io.TextIOWrapper(self.stderr)
 
Index: Lib/codecs.py
===================================================================
--- Lib/codecs.py	(révision 66888)
+++ Lib/codecs.py	(copie de travail)
@@ -867,7 +867,7 @@
        'b' not in mode:
         # Force opening of the file in binary mode
         mode = mode + 'b'
-    file = builtins.open(filename, mode, buffering)
+    file = builtins.open(filename, mode, buffering=buffering)
     if encoding is None:
         return file
     info = lookup(encoding)
Index: Lib/test/test_io.py
===================================================================
--- Lib/test/test_io.py	(révision 66888)
+++ Lib/test/test_io.py	(copie de travail)
@@ -211,7 +211,7 @@
                 print("Use 'regrtest.py -u largefile test_io' to run it.",
                       file=sys.stderr)
                 return
-        f = io.open(support.TESTFN, "w+b", 0)
+        f = io.open(support.TESTFN, "w+b", buffering=0)
         self.large_file_ops(f)
         f.close()
         f = io.open(support.TESTFN, "w+b")
@@ -221,12 +221,12 @@
     def test_with_open(self):
         for bufsize in (0, 1, 100):
             f = None
-            with open(support.TESTFN, "wb", bufsize) as f:
+            with open(support.TESTFN, "wb", buffering=bufsize) as f:
                 f.write(b"xxx")
             self.assertEqual(f.closed, True)
             f = None
             try:
-                with open(support.TESTFN, "wb", bufsize) as f:
+                with open(support.TESTFN, "wb", buffering=bufsize) as f:
                     1/0
             except ZeroDivisionError:
                 self.assertEqual(f.closed, True)
@@ -261,7 +261,7 @@
     def test_array_writes(self):
         a = array.array('i', range(10))
         n = len(memoryview(a))
-        f = io.open(support.TESTFN, "wb", 0)
+        f = io.open(support.TESTFN, "wb", buffering=0)
         self.assertEqual(f.write(a), n)
         f.close()
         f = io.open(support.TESTFN, "wb")
Index: Lib/test/test_file.py
===================================================================
--- Lib/test/test_file.py	(révision 66888)
+++ Lib/test/test_file.py	(copie de travail)
@@ -168,11 +168,11 @@
         # misbehaviour especially with repeated close() calls
         for s in (-1, 0, 1, 512):
             try:
-                f = open(TESTFN, 'wb', s)
+                f = open(TESTFN, 'wb', buffering=s)
                 f.write(str(s).encode("ascii"))
                 f.close()
                 f.close()
-                f = open(TESTFN, 'rb', s)
+                f = open(TESTFN, 'rb', buffering=s)
                 d = int(f.read().decode("ascii"))
                 f.close()
                 f.close()