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38 lines
1.5 KiB
Markdown
38 lines
1.5 KiB
Markdown
# Textual Devtools
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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.
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## Run
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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.
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```bash
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textual run my_app.py
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```
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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:
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```
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textual run my_app.py:alternative_app
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```
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## Console
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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 typically overwrite application content, which generally makes an unreadable mess. Fortunately Textual supplies a debug console of it's own which has some super helpful features.
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To use the console, open up 2 console emulators. In the first one, run the following:
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```bash
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textual console
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```
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In the other console, run your application using `textual run` and the `--dev` switch:
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```bash
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textual run my_app.py --dev
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```
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You should notice that the console will display information regarding the running application, such as events which are sent.
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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)`.
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