[issue31603] Please add argument to override stdin/out/err in the input builtin

[Wren Turkal]

Wren Turkal  added the comment:

I'm not sure that I ever got a definitive issue, but I didn't have time to
push it forward. I still think the idea has merit. I'd love to see it
implemented, but I don't have the time to pursue it right now.

Thanks,
wt

On Mon, Jan 17, 2022 at 10:23 AM Irit Katriel 
wrote:

>
> Irit Katriel  added the comment:
>
> See also Issue1927.
>
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[issue31603] Please add argument to override stdin/out/err in the input builtin

[Irit Katriel]

Irit Katriel  added the comment:

See also Issue1927.

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[anthony shaw]

anthony shaw  added the comment:

The discussion on python-ideas has some unresolved questions. Wren, did you get 
a definitive answer on this idea?

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[Cheryl Sabella]

Cheryl Sabella  added the comment:

For reference, here's the link to the Python ideas thread:

https://mail.python.org/pipermail/python-ideas/2017-September/047230.html

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[Wren Turkal]

Wren Turkal  added the comment:

Added a PR to facilitate discussion on python-ideas.

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keywords: +patch
pull_requests: +3798
stage:  -> patch review

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

input() is a convenient function for simple user interaction. If you need to 
read a data from different file object just use its readline() method.

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[R. David Murray]

R. David Murray  added the comment:

This is probably a topic for the python-ideas mailing list.  For example, 
rather than complicating input, it might be better to propose adding a 
redirect_stdin to contextlib to parallel the two existing redirect context 
managers.  I don't remember why that was not added when the others were, but 
there was probably a reason, so a discussion about what the best solution is 
for the use case is in order, and python-ideas is the place for that.

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[Wren Turkal]

Wren Turkal  added the comment:

This might also allow simplification of the getpass.unix_getpass() logic. I am 
not 100% sure about that yet though.

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[issue31603] Please add argument to override stdin/out/err in the input builtin

[Wren Turkal]

New submission from Wren Turkal :

I would really love to add a few params to input so that it's signature looked 
more like so:

def input(prompt, /, *, fin=sys.stdin, fout=sys.stdout, ferr=sys.stderr):
...

This would certainly make overriding the the files in specific calls to input 
easier. A reasonable use case is collecting a piece over /dev/tty explicitly so 
that a redirected stdin could be used to pipe data into a program while 
overriding using /dev/tty to collect some piece of data. Here's some code 
illustrating what I'd like:

import sys
sys.stdin.close()
sys.stdin = open('/dev/null', 'r')
with open('/dev/tty', 'r') as f:
x = input('Name? ', fin=f)
print(x)

FWIW, I have actually already implemented this fully (including tests). I am 
just trying to see what I need to do to allow release since I am work on my 
employer's time.

In the interest of getting feedback, does the signature provided above look 
sane?

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components: IO
messages: 303103
nosy: wt
priority: normal
severity: normal
status: open
title: Please add argument to override stdin/out/err in the input builtin
versions: Python 3.7

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