[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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stage:  -> resolved
status: open -> closed

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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

[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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[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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