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

[Nick Coghlan]

Calling detach() on the standard streams is a bad idea - the interpreter
uses the originals internally, and calling detach() breaks them.

--
Sent from my phone, thus the relative brevity :)
On Jun 10, 2012 6:03 AM, "Serhiy Storchaka" <storchaka at gmail.com> wrote:

> On 09.06.12 12:55, Nick Coghlan wrote:
>
>> So, after much digging, it appears the *right* way to replace a
>> standard stream in Python 3 after application start is to do the
>> following:
>>
>>     sys.stdin = open(sys.stdin.fileno(), 'r',<new settings>)
>>     sys.stdout = open(sys.stdout.fileno(), 'w',<new settings>)
>>     sys.stderr = open(sys.stderr.fileno(), 'w',<new settings>)
>>
>
>    sys.stdin = io.TextIOWrapper(sys.stdin.**detach(), <new settings>)
>    sys.stdout = io.TextIOWrapper(sys.stdout.**detach(), <new settings>)
>    ...
>
> None of these methods are not guaranteed to work if the input or output
> have occurred before.
>
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