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Python 3.13 and 3.14 REPL on Windows Terminal is chopping off the first four characters printed if end parameter is used in print function #128809
Description
Bug report
Bug description:
If I use the end parameter in print function, the first four characters (including whitespaces) of the output are chopped off. I have tried using other Python versions (3.10 - 3.12) and everything works well. It is somewhat strange that this happens only on Python 3.13 REPL in Windows Terminal or Command Prompt. Consider the MRE below:
for i in range(10):
print(i, end='')prints: 456789. Numbers 0, 1, 2, and 3 are missing.
Also
print('first', end='|')prints t| instead of first|. Characters 'f', 'i', 'r', 's' are missing.
My specific version is Python 3.13.0. I'd like to know if this is happening because I'm on a Windows machine or is it an issue with Python 3.13.0? Thanks.
CPython versions tested on:
3.10, 3.11, 3.12, 3.13
Operating systems tested on:
Windows
Activity
picnixz commentedon Jan 14, 2025
Can you test with the latest Python 3.13 release? we're currently at 3.13.1. I cannot reproduce this on Linux and on 3.14.
eendebakpt commentedon Jan 14, 2025
I can confirm this issue on latest main (Windows). It might be the first three characters are printed, but then overwritten by the prompt
>>>picnixz commentedon Jan 14, 2025
cc @pablogsal
pablogsal commentedon Jan 14, 2025
Unfortunately I don't have a windows machine at the moment 😕. @DinoV @zooba @ambv can you take a look if you have some free cycles?
rruuaanng commentedon Jan 15, 2025
The strange thing is that it seems to be related to outputting
end.devdanzin commentedon Mar 9, 2025
I believe this is a duplicate of #128067. I'm submitting a PR for these issues soon.
picnixz commentedon Mar 9, 2025
Yes it's a duplicate
uche-wealth commentedon Oct 11, 2025
I just got Python 3.14 and this issue is still there on Windows. Any plans to fix this?
[-]Python 3.13 REPL on Windows Terminal is chopping off the first four characters printed if `end` parameter is used in `print` function[/-][+]Python 3.13 and 3.14 REPL on Windows Terminal is chopping off the first four characters printed if `end` parameter is used in `print` function[/+]