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Devtools
Textual comes with a command line application of the same name. The textual command is a super useful tool that will help you to build apps.
Take a moment to look through the available sub-commands. There will be even more helpful tools here in the future.
textual --help
Run
You can run Textual apps with the run subcommand. If you supply a path to a Python file it will load and run the application.
textual run my_app.py
The run sub-command assumes you have a Application instance called app in the global scope of your Python file. If the application is called something different, you can specify it with a colon following the filename:
textual run my_app.py:alternative_app
!!! note
If the Python file contains a call to app.run() then you can launch the file as you normally would any other Python program. Running your app via `textual run` will give you access to a few Textual features such as dev mode which auto (re) loads your CSS if you change it.
Console
When running any terminal application, you can no longer use print when debugging (or log to the console). This is because anything you write to standard output would overwrite application content, making it unreadable. Fortunately Textual supplies a debug console of it's own which has some super helpful features.
To use the console, open up 2 terminal emulators. In the first one, run the following:
textual console
This should look something like the following:
In the other console, run your application using textual run and the --dev switch:
textual run my_app.py --dev
Anything you print from your application will be displayed in the console window. You can also call the log() method on App and Widget objects for advanced formatting. Try it with self.log(self.tree).