commit 6cfc5124f2a615922d32ac19a319ffab8edaad0f
author Antoine Pitrou <solipsis@pitrou.net> Tue Dec 21 21:26:09 2010 +0000
committer Antoine Pitrou <solipsis@pitrou.net> Tue Dec 21 21:26:09 2010 +0000
tree 1d6b68e8021f9e1e10d7b32fad7708e39f4b30de
parent 9fc6b6c4536417283c6f52b6dfb4c82afb372448

Merged revisions 87427 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r87427 | antoine.pitrou | 2010-12-21 22:20:59 +0100 (mar., 21 déc. 2010) | 3 lines

  Issue #10750: The `raw` attribute of buffered IO objects is now read-only.
........

Lib/_pyio.py

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 4485233..b350bd4 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -674,7 +674,7 @@
     """
 
     def __init__(self, raw):
-        self.raw = raw
+        self._raw = raw
 
     ### Positioning ###
 
@@ -718,8 +718,8 @@
         if self.raw is None:
             raise ValueError("raw stream already detached")
         self.flush()
-        raw = self.raw
-        self.raw = None
+        raw = self._raw
+        self._raw = None
         return raw
 
     ### Inquiries ###
@@ -734,6 +734,10 @@
         return self.raw.writable()
 
     @property
+    def raw(self):
+        return self._raw
+
+    @property
     def closed(self):
         return self.raw.closed
 
@@ -1444,7 +1448,7 @@
             if not isinstance(errors, str):
                 raise ValueError("invalid errors: %r" % errors)
 
-        self.buffer = buffer
+        self._buffer = buffer
         self._line_buffering = line_buffering
         self._encoding = encoding
         self._errors = errors
@@ -1499,6 +1503,10 @@
     def line_buffering(self):
         return self._line_buffering
 
+    @property
+    def buffer(self):
+        return self._buffer
+
     def seekable(self):
         return self._seekable
 
@@ -1713,8 +1721,8 @@
         if self.buffer is None:
             raise ValueError("buffer is already detached")
         self.flush()
-        buffer = self.buffer
-        self.buffer = None
+        buffer = self._buffer
+        self._buffer = None
         return buffer
 
     def seek(self, cookie, whence=0):

Lib/test/test_io.py

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index ab8479d..5f62494 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -693,6 +693,13 @@
         b.close()
         self.assertRaises(ValueError, b.flush)
 
+    def test_readonly_attributes(self):
+        raw = self.MockRawIO()
+        buf = self.tp(raw)
+        x = self.MockRawIO()
+        with self.assertRaises(AttributeError):
+            buf.raw = x
+
 
 class BufferedReaderTest(unittest.TestCase, CommonBufferedTests):
     read_mode = "rb"
@@ -2210,6 +2217,12 @@
         txt.close()
         self.assertRaises(ValueError, txt.flush)
 
+    def test_readonly_attributes(self):
+        txt = self.TextIOWrapper(self.BytesIO(self.testdata), encoding="ascii")
+        buf = self.BytesIO(self.testdata)
+        with self.assertRaises(AttributeError):
+            txt.buffer = buf
+
 class CTextIOWrapperTest(TextIOWrapperTest):
 
     def test_initialization(self):