[issue18838] The order of interactive prompt and traceback on Windows

[Irit Katriel]

Irit Katriel  added the comment:

Thanks. I'm closing this because 3.7 is only getting security fixes now.

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[issue18838] The order of interactive prompt and traceback on Windows

[Adam Bartoš]

Adam Bartoš  added the comment:

The order is fine on Python 3.8, Windows 10.

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[issue18838] The order of interactive prompt and traceback on Windows

[Adam Bartoš]

Adam Bartoš  added the comment:

So far I could reproduce the issue on Python 3.7, Windows Vista 64bit. I'll try 
with newer versions.

The output I got:
>>> from subprocess import *
>>> Popen("py -i foo.py", stdin=PIPE, stdout=PIPE, stderr=PIPE).communicate()
(b'', b'>>> Traceback (most recent call last):\r\n  File "foo.py", line 2, in 
\r\n1/0\r\nZeroDivisionError: division by zero\r\n\r\n')

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[issue18838] The order of interactive prompt and traceback on Windows

[Irit Katriel]

Irit Katriel  added the comment:

On version 3.10, windows 10 I don't see this - the prompt comes after the 
traceback.

Adam, are you seeing this issue on any python version >= 3.8?

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status: open -> pending

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[issue18838] The order of interactive prompt and traceback on Windows

[Adam Bartoš]

Adam Bartoš added the comment:

Yes, it is a behavior change between Python 2 and Python 3. I just tried with 
2.7 and 3.0.

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[issue18838] The order of interactive prompt and traceback on Windows

[Drekin]

New submission from Drekin:

On Windows, Python 3.3.2, when I run Python as a subprocess via Popen(py -i 
somescript.py, stdin=PIPE, stdout=PIPE, stderr=PIPE).communicate() and 
somescript.py ends with exception, there is first interactive promt  in 
stderr output and then the traceback which is reversed to standard order when 
somescript.py is run interactively directly.

Corresponding StackOverflow question: 
http://stackoverflow.com/questions/18419724/position-of-prompt-in-stderr-after-systemexit
 .

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components: Windows
messages: 196192
nosy: Drekin
priority: normal
severity: normal
status: open
title: The order of interactive prompt and traceback on Windows
type: behavior
versions: Python 3.3

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[issue18838] The order of interactive prompt and traceback on Windows

[R. David Murray]

R. David Murray added the comment:

For anyone who wants to look in to this: according to the stack overflow 
question and comments, this is a behavior change between python2 and python3.

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