Max Bachmann <kont...@maxbachmann.de> added the comment:
> That is using Python 3.9 in the xfce4-terminal. Which xterm are you using?
This was in the default gnome terminal that is pre-installed on Fedora 34 and
on windows I directly opened the Python Terminal. I just installed
xfce4-terminal on my Fedora 34 machine which has exactly the same behavior for
me that I had in the gnome terminal.
> But regardless, I cannot replicate the behavior you show where list(s) is
> different from indexing the characters one by one.
That is what surprised me the most. I just ran into this because this was
somehow generated when fuzz testing my code using hypothesis (which uncovered
an unrelated bug in my application). However I was quite confused by the
character order when debugging it.
My original case was:
```
s1='00ĀĀĀĀ'
s2='9010𐤀000\x8dÀĀĀĀ222Ā'
parts = [s2[max(0, i) : min(len(s2), i+len(s1))] for i in range(-len(s1),
len(s2))]
for part in parts:
print(list(part))
```
which produced
```
[]
['9']
['9', '0']
['9', '0', '1']
['9', '0', '1', '0']
['9', '0', '1', '0', '𐤀']
['9', '0', '1', '0', '𐤀', '0']
['0', '1', '0', '𐤀', '0', '0']
['1', '0', '𐤀', '0', '0', '0']
['0', '𐤀', '0', '0', '0', '\x8d']
['𐤀', '0', '0', '0', '\x8d', 'À']
['0', '0', '0', '\x8d', 'À', 'Ā']
['0', '0', '\x8d', 'À', 'Ā', 'Ā']
['0', '\x8d', 'À', 'Ā', 'Ā', 'Ā']
['\x8d', 'À', 'Ā', 'Ā', 'Ā', '2']
['À', 'Ā', 'Ā', 'Ā', '2', '2']
['Ā', 'Ā', 'Ā', '2', '2', '2']
['Ā', 'Ā', '2', '2', '2', 'Ā']
['Ā', '2', '2', '2', 'Ā']
['2', '2', '2', 'Ā']
['2', '2', 'Ā']
['2', 'Ā']
['ĀÀ]
```
which has a missing single quote:
- ['ĀÀ]
changing direction of characters including commas:
- ['1', '0', '𐤀', '0', '0', '0']
changing direction back:
- ['𐤀', '0', '0', '0', '\x8d', 'À']
> AFAICT, there is no bug here. It's just confusing how Unicode right-to-left
> characters in the repr() can modify how it's displayed in the
> console/terminal.
Yes it appears the same confusion occurs in other applications like Firefox and
VS Code.
Thanks at @eryksun and @steven.daprano for testing and telling me about
Bidirectional writing in Unicode (The more I know about Unicode the more it
scares me)
----------
status: pending -> open
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45105>
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