[Python-ideas] Replacing the standard IO streams (was Re: changing sys.stdout encoding)

[Paul Moore]

On 10 June 2012 19:12, MRAB <python at mrabarnett.plus.com> wrote:
> On 10/06/2012 17:41, Stephen J. Turnbull wrote:
>> I am a little concerned with MRAB's report that
>>
>>     import sys
>>     print("hello")
>>     sys.stdout.flush()
>>     sys.stdout = open(sys.stdout.fileno(), 'w', encoding='utf-8')
>>     print("hello")
>>
>> doesn't work as expected, though.  (It does work for me on Mac OS X,
>> both as above -- of course there are no '\r's in the output -- and
>> with 'print("hello", end="\r\n")'.)
>>
> That's actually Python 3.1. From Python 3.2 it's slightly different,
> but still not quite right:
>
> Python 3.1:     "hello\r\nhello\r\r\n"
> Python 3.2:     "hello\nhello\r\n"
> Python 3.3.0a4: "hello\nhello\r\n"
>
> All on Windows.

Not here (Win 7 32-bit):

PS D:\Data> type t.py
import sys
print("Hello!")
sys.stdout.flush()

sys.stdout = open(sys.stdout.fileno(), 'w', encoding='utf-8')
print("Hello!")
PS D:\Data> py -3.2 t.py | od -c
0000000   H   e   l   l   o   !  \r  \n   H   e   l   l   o   !  \r  \n
0000020

Paul.