version 4.4: interactive shell: arrow keys yield weird symbols

[eachimei]

Description

With version 4.4.1 on Windows, after importing progressbar: pressing any arrow key yield odd symbols on the console:

Code

>>> import progressbar
>>> ^[[A^[[C^[[D^[[C^[[D^[[C^[[D^[[B^[[D^[[C^[[A^[[C^[[B^[[D   # <-- this is what happens when pressing different arrow keys on the keyboard

Versions

• Python version: import sys; print(sys.version): 3.10.9
• Python distribution/environment: CPython
• Operating System: Windows 10
• Package version: import progressbar; print(progressbar.__version__) : 4.4.1

[eachimei]

Suspecting this change:

a9c6770#diff-5bd70fb63160004c558a687f98cb5dfe4a8925be30f161048b96966cd9de054bR170

Before this, set_console_mode() was not invoked by just importing progressbar

[wolph]

You are very likely right... that mode enables 24 bit color support in your terminal but apparently it has side-effects in some cases.

For some reason the console mode isn't reverted back to it's original state once the script is done it seems so that's certainly a bug.

As a quick workaround, I can't reproduce the issue in PowerShell so that might help

[eachimei]

Thanks for the quick response!
I am able to reproduce it on Powershell as well:

[wolph]

Oh... that's odd. Generally on Linux/Unix systems this is caused by not having readline available, but while it's better with readline, it doesn't solve the issue for me it seems.

You can try like this:

pip install pyreadline3

And after that:

import pyreadline3
pyreadline3.Readline()

[eachimei]

Still buggy, this time pressing arrow keys makes parts of the terminal to disappear:

if I press some more arrow keys, it will erase more chunks:

[wolph]

I've pushed a fix to the develop branch, can you see if it works for you?

pip install "git+https://github.com/wolph/python-progressbar.git#egg=progressbar2"

[eachimei]

Looks good! The issue does not reproduce with this version (commit 20f1bbb)

[wolph]

The new release is online!

[eachimei]

Thanks @wolph ! I currently don't see a new release (4.4.2 ?) on pypi though:
https://pypi.org/project/progressbar2/#history

[wolph]

Odd... I've attempted to upload it again and it seems to have worked this time :)

[eachimei]

Cheers, thank you! Confirmed no issue using 4.4.2 👍