diff options
Diffstat (limited to 'Modules/_io/_iomodule.c')
| -rw-r--r-- | Modules/_io/_iomodule.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c index dfd66aa..14a4356 100644 --- a/Modules/_io/_iomodule.c +++ b/Modules/_io/_iomodule.c @@ -219,10 +219,20 @@ PyDoc_STRVAR(open_doc, "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" |