[issue36293] Nonblocking read sys.stdin raises error

[Martin Panter]

Change by Martin Panter :


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resolution:  -> duplicate

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[issue36293] Nonblocking read sys.stdin raises error

[Martin Panter]

Martin Panter  added the comment:

I wasn’t sure about closing it, in case Cyker came back with more details. E.g. 
what was the use case? Were they mislead by the documentation? Do they just 
think the error should be different, or do they think there should be no error 
in this case?

But I suppose we can close this and keep discussion about non-blocking text 
input together in the existing reports.

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stage:  -> resolved
status: open -> closed

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[issue36293] Nonblocking read sys.stdin raises error

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Martin, did you mean to close this as a duplicate?

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nosy: +terry.reedy

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[issue36293] Nonblocking read sys.stdin raises error

[Martin Panter]

Martin Panter  added the comment:

This is the same story as in Issue 35762. Both “sys.stdin” and 
“subprocess.Popen.stderr” (when universal_newlines=True is enabled) use the 
TextIOWrapper class, which I don’t think was implemented with non-blocking mode 
in mind.

Issue 24560 is similar, but is about an older class “codecs.StreamReader”.

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nosy: +martin.panter
superseder:  -> subprocess.Popen with universal_newlines and nonblocking 
streams fails with "can't concat NoneType to bytes"

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[issue36293] Nonblocking read sys.stdin raises error

[Cyker Way]

New submission from Cyker Way :

This piece of code will raise an error:

import os
import sys

os.set_blocking(sys.stdin.fileno(), False)
sys.stdin.read()

Error:

>   TypeError: can't concat NoneType to bytes

Not sure if this is relevant (for a different version of Python): 
https://bugs.python.org/issue24560

--
components: Library (Lib), Unicode
messages: 337940
nosy: cykerway, ezio.melotti, vstinner
priority: normal
severity: normal
status: open
title: Nonblocking read sys.stdin raises error
versions: Python 3.7

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