TextArea.code_editor is not working

[tibetsam]

i've checked #4911 and #4358 but which couldn't help me.
the example code is also not working for me, and available_languages returns empty list, text are not highlighted although i have all required lib installed

~> pip list
Package Version

---

beautifulsoup4 4.13.3
bs4 0.0.2
certifi 2025.1.31
charset-normalizer 3.4.1
idna 3.10
Levenshtein 0.25.1
linkify-it-py 2.0.3
markdown-it-py 3.0.0
mdit-py-plugins 0.4.2
mdurl 0.1.2
numpy 1.24.4
pip 20.2.1
platformdirs 4.3.6
pygments 2.19.1
rapidfuzz 3.9.7
requests 2.32.3
rich 13.9.4
setuptools 49.2.1
soupsieve 2.6
textual 2.1.1
tree-sitter 0.21.3
tree-sitter-languages 1.10.2
typing-extensions 4.12.2
uc-micro-py 1.0.3
urllib3 2.2.3

[willmcgugan]

Please try and give a little more information if you need help. We generally need more information than it is "not working".

I think all you are missing it installing textual[syntax] See the following link https://textual.textualize.io/widgets/text_area/#syntax-highlighting-dependencies

[tibetsam]

sorry, basically my problem is text is not highlighted and attr available_languages returns empty list although I've read docs and installed all dependancy.
> pip install textual[syntax]
Requirement already satisfied: textual[syntax] in ./app/python3/lib/python3.8/site-packages (2.1.1)
Requirement already satisfied: rich>=13.3.3 in ./app/python3/lib/python3.8/site-packages (from textual[syntax]) (13.9.4)
Requirement already satisfied: typing-extensions<5.0.0,>=4.4.0 in ./app/python3/lib/python3.8/site-packages (from textual[syntax]) (4.12.2)
Requirement already satisfied: platformdirs<5,>=3.6.0 in ./app/python3/lib/python3.8/site-packages (from textual[syntax]) (4.3.6)
Requirement already satisfied: markdown-it-py[linkify,plugins]>=2.1.0 in ./app/python3/lib/python3.8/site-packages (from textual[syntax]) (3.0.0)
Requirement already satisfied: pygments<3.0.0,>=2.13.0 in ./app/python3/lib/python3.8/site-packages (from rich>=13.3.3->textual[syntax]) (2.19.1)
Requirement already satisfied: mdurl=0.1 in ./app/python3/lib/python3.8/site-packages (from markdown-it-py[linkify,plugins]>=2.1.0->textual[syntax]) (0.1.2)
Requirement already satisfied: linkify-it-py<3,>=1; extra == "linkify" in ./app/python3/lib/python3.8/site-packages (from markdown-it-py[linkify,plugins]>=2.1.0->textual[syntax]) (2.0.3)
Requirement already satisfied: mdit-py-plugins; extra == "plugins" in ./app/python3/lib/python3.8/site-packages (from markdown-it-py[linkify,plugins]>=2.1.0->textual[syntax]) (0.4.2)
Requirement already satisfied: uc-micro-py in ./app/python3/lib/python3.8/site-packages (from linkify-it-py<3,>=1; extra == "linkify"->markdown-it-py[linkify,plugins]>=2.1.0->textual[syntax]) (1.0.3)
WARNING: You are using pip version 20.2.1; however, version 25.0.1 is available.
You should consider upgrading via the '/home/erenqgo/app/python3/bin/python3.8 -m pip install --upgrade pip' command.

[TomJGooding]

You'll need to update your Python version. Python 3.8 reached end-of-life in October 2024, and the latest versions for the tree-sitters dependencies require >=3.9.