Windows blank screen?

[dgrahn]

I'm trying to run this code through anaconda prompt on windows. All I see is a blank screen. 😢 I installed from pip, version 0.1.17.

from textual.app import App
from textual.widgets import Placeholder


class SimpleApp(App):

    async def on_mount(self) -> None:
        await self.view.dock(Placeholder(), edge="left", size=40)
        await self.view.dock(Placeholder(), Placeholder(), edge="top")


SimpleApp.run(log="textual.log")

[LuminairPrime]

Just downloaded Textual now, and I noticed that all the examples work when manually run by typing the command in the command line, but not when double clicking the python file...

[LuminairPrime]

I personally have Python 3.10.1 installed, and I only see Python310 in the path variable...

[USLTD]

So you have only ONE Python version/instance installed on entire computer right?
Can you upload your terminal and OS details?
Also it would be preferred to upload output from bellow commands

python -m rich.diagnose
pip freeze | grep rich # only if you have grep installed

[LuminairPrime]

Windows 10 for me. FYI there is another similar report: #321

The rich diagnose works when manually entered in cmd.exe, but so do the examples when manually entered. Also, other GUI library examples I tried double-clicking DO work, like asciimatics.

So, there's something going wrong between the Python application window that Windows launches when double-clicking a .py file, and Textualize. Maybe this is related, or unrelated, to the OP's Anaconda problem....

[USLTD]

@LuminairPrime , what is default app set for .py extension on your computer?

[LuminairPrime]

Just the default. It has that blue and yellow Python logo at the top left, and the path is: users, username, appdata, local, programs, python, launcher, py.exe

[dgrahn]

Could you clarify the question? I have Anaconda installed. No stand-alone versions of Python (just those integrated into the environments).

…

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[yehnan]

I have the same issue, that is, textual on Windows 10 only shows blank screen.

I use the following commands to install textual:
conda create -n python=3.7
conda activate py37
conda install git pip
pip install git+git://github.com/Textualize/textual@main

But
python -m textual.app
only shows blank screen.

rich installed version is: 12.0.1
textual installed version is 0.1.17

python -m rich.diagnose
┌───────────────────────── <class 'rich.console.Console'> ─────────────────────────┐
│ A high level console interface. │
│ │
│ ┌──────────────────────────────────────────────────────────────────────────────┐ │
│ │ │ │
│ └──────────────────────────────────────────────────────────────────────────────┘ │
│ │
│ color_system = 'windows' │
│ encoding = 'utf-8' │
│ file = <_io.TextIOWrapper name='' mode='w' encoding='utf-8'> │
│ height = 30 │
│ is_alt_screen = False │
│ is_dumb_terminal = False │
│ is_interactive = True │
│ is_jupyter = False │
│ is_terminal = True │
│ legacy_windows = True │
│ no_color = False │
│ options = ConsoleOptions( │
│ size=ConsoleDimensions(width=94, height=30), │
│ legacy_windows=True, │
│ min_width=1, │
│ max_width=94, │
│ is_terminal=True, │
│ encoding='utf-8', │
│ max_height=30, │
│ justify=None, │
│ overflow=None, │
│ no_wrap=False, │
│ highlight=None, │
│ markup=None, │
│ height=None │
│ ) │
│ quiet = False │
│ record = False │
│ safe_box = True │
│ size = ConsoleDimensions(width=94, height=30) │
│ soft_wrap = False │
│ stderr = False │
│ style = None │
│ tab_size = 8 │
│ width = 94 │
└──────────────────────────────────────────────────────────────────────────────────┘
┌─── <class 'rich._windows.WindowsConsoleFeatures'> ────┐
│ Windows features available. │
│ │
│ ┌───────────────────────────────────────────────────┐ │
│ │ WindowsConsoleFeatures(vt=False, truecolor=False) │ │
│ └───────────────────────────────────────────────────┘ │
│ │
│ truecolor = False │
│ vt = False │
└───────────────────────────────────────────────────────┘
┌────── Environment Variables ───────┐
│ { │
│ 'TERM': None, │
│ 'COLORTERM': None, │
│ 'CLICOLOR': None, │
│ 'NO_COLOR': None, │
│ 'TERM_PROGRAM': None, │
│ 'COLUMNS': None, │
│ 'LINES': None, │
│ 'JPY_PARENT_PID': None, │
│ 'VSCODE_VERBOSE_LOGGING': None │
│ } │
└────────────────────────────────────┘
platform="Windows"

[dgrahn]

@UltraStudioLTD I tried from both pip and git. Are you using cmd or powershell?

[USLTD]

I am using CMD and WT (Windows Terminal. Both preview and stable). I have even tried the PuTTY and MingW terminal.

[USLTD]

Can you try in non-virtual environment. Outside of conda?

[USLTD]

Although I should also mention that I don't use Conda

[BoniLindsley]

Adding to the information available, this is a repro video. It shows the following

py -m pip install --user --upgrade --compile textual
:: rich 12.4.1
:: textual 0.1.18

py -m rich.diganose
py -m rich
py -m textual.app

After launching textual.app,

• Resizing the console refreshed rendering, with artifacts.
• Mouse button pressed on Q | Quit exits app. Keyboard q also works.
• Held Enter to move prompt. Shows scroll buffer in new lines.
  • Mostly mitigated by disabling scroll buffer as in https://superuser.com/a/1108493. Sometimes the last line from app repeats without colours.

This is on Windows 10 Version 20H2, using Python 3.10.2 from https://www.python.org/downloads/.

Potentially related: #305.

Edit: Thank you to @DavinderJolly for the following:

• Textual works as is on Alacritty and Windows Terminal.
• Mostly works on PowerShell 7. May not clear screen after shutdown.
• Blank screen as illustrated for Windows Console and Windows PowerShell. However, calling os.system("") before creating App helps. Somehow.