[Python-checkins] r76900 - in python/branches/py3k: Doc/library/io.rst Lib/_pyio.py Modules/_io/_iomodule.c

antoine.pitrou python-checkins at python.org
Sat Dec 19 22:08:31 CET 2009


Author: antoine.pitrou
Date: Sat Dec 19 22:08:31 2009
New Revision: 76900

Log:
Merged revisions 76896,76898 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r76896 | antoine.pitrou | 2009-12-19 22:01:10 +0100 (sam., 19 déc. 2009) | 3 lines
  
  Issue #7545: improve documentation of the `buffering` argument in io.open().
........
  r76898 | antoine.pitrou | 2009-12-19 22:06:36 +0100 (sam., 19 déc. 2009) | 3 lines
  
  Remove superfetatory paragraph (left there by mistake).
........


Modified:
   python/branches/py3k/   (props changed)
   python/branches/py3k/Doc/library/io.rst
   python/branches/py3k/Lib/_pyio.py
   python/branches/py3k/Modules/_io/_iomodule.c

Modified: python/branches/py3k/Doc/library/io.rst
==============================================================================
--- python/branches/py3k/Doc/library/io.rst	(original)
+++ python/branches/py3k/Doc/library/io.rst	Sat Dec 19 22:08:31 2009
@@ -96,10 +96,20 @@
    strings, the bytes having been first decoded using a platform-dependent
    encoding or using the specified *encoding* if given.
 
-   *buffering* is an optional integer used to set the buffering policy.  By
-   default full buffering is on.  Pass 0 to switch buffering off (only allowed
-   in binary mode), 1 to set line buffering, and an integer > 1 to indicate the
-   size of the buffer.
+   *buffering* is an optional integer used to set the buffering policy.
+   Pass 0 to switch buffering off (only allowed in binary mode), 1 to select
+   line buffering (only usable in text mode), and an integer > 1 to indicate
+   the size of a fixed-size chunk buffer.  When no *buffering* argument is
+   given, the default buffering policy works as follows:
+
+   * Binary files are buffered in fixed-size chunks; the size of the buffer
+     is chosen using a heuristic trying to determine the underlying device's
+     "block size" and falling back on :attr:`DEFAULT_BUFFER_SIZE`.
+     On many systems, the buffer will typically be 4096 or 8192 bytes long.
+
+   * "Interactive" text files (files for which :meth:`isatty` returns True)
+     use line buffering.  Other text files use the policy described above
+     for binary files.
 
    *encoding* is the name of the encoding used to decode or encode the file.
    This should only be used in text mode.  The default encoding is platform

Modified: python/branches/py3k/Lib/_pyio.py
==============================================================================
--- python/branches/py3k/Lib/_pyio.py	(original)
+++ python/branches/py3k/Lib/_pyio.py	Sat Dec 19 22:08:31 2009
@@ -82,10 +82,20 @@
     returned as strings, the bytes having been first decoded using a
     platform-dependent encoding or using the specified encoding if given.
 
-    buffering is an optional integer used to set the buffering policy. By
-    default full buffering is on. Pass 0 to switch buffering off (only
-    allowed in binary mode), 1 to set line buffering, and an integer > 1
-    for full buffering.
+    buffering is an optional integer used to set the buffering policy.
+    Pass 0 to switch buffering off (only allowed in binary mode), 1 to select
+    line buffering (only usable in text mode), and an integer > 1 to indicate
+    the size of a fixed-size chunk buffer.  When no buffering argument is
+    given, the default buffering policy works as follows:
+
+    * Binary files are buffered in fixed-size chunks; the size of the buffer
+      is chosen using a heuristic trying to determine the underlying device's
+      "block size" and falling back on `io.DEFAULT_BUFFER_SIZE`.
+      On many systems, the buffer will typically be 4096 or 8192 bytes long.
+
+    * "Interactive" text files (files for which isatty() returns True)
+      use line buffering.  Other text files use the policy described above
+      for binary files.
 
     encoding is the name of the encoding used to decode or encode the
     file. This should only be used in text mode. The default encoding is

Modified: python/branches/py3k/Modules/_io/_iomodule.c
==============================================================================
--- python/branches/py3k/Modules/_io/_iomodule.c	(original)
+++ python/branches/py3k/Modules/_io/_iomodule.c	Sat Dec 19 22:08:31 2009
@@ -219,10 +219,20 @@
 "returned as strings, the bytes having been first decoded using a\n"
 "platform-dependent encoding or using the specified encoding if given.\n"
 "\n"
-"buffering is an optional integer used to set the buffering policy. By\n"
-"default full buffering is on. Pass 0 to switch buffering off (only\n"
-"allowed in binary mode), 1 to set line buffering, and an integer > 1\n"
-"for full buffering.\n"
+"buffering is an optional integer used to set the buffering policy.\n"
+"Pass 0 to switch buffering off (only allowed in binary mode), 1 to select\n"
+"line buffering (only usable in text mode), and an integer > 1 to indicate\n"
+"the size of a fixed-size chunk buffer.  When no buffering argument is\n"
+"given, the default buffering policy works as follows:\n"
+"\n"
+"* Binary files are buffered in fixed-size chunks; the size of the buffer\n"
+"  is chosen using a heuristic trying to determine the underlying device's\n"
+"  \"block size\" and falling back on `io.DEFAULT_BUFFER_SIZE`.\n"
+"  On many systems, the buffer will typically be 4096 or 8192 bytes long.\n"
+"\n"
+"* \"Interactive\" text files (files for which isatty() returns True)\n"
+"  use line buffering.  Other text files use the policy described above\n"
+"  for binary files.\n"
 "\n"
 "encoding is the name of the encoding used to decode or encode the\n"
 "file. This should only be used in text mode. The default encoding is\n"


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