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Will McGugan
2022-08-23 12:17:11 +01:00
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docs/guide/devtools.md
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@@ -28,20 +28,24 @@ textual run my_app.py:alternative_app
## 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 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.
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 console emulators. In the first one, run the following:
To use the console, open up 2 terminal emulators. In the first one, run the following:
```bash
textual console
```
This should look something like the following:
```{.textual title="textual console" path="docs/examples/getting_started/console.py", press="_,_"}
```
In the other console, run your application using `textual run` and the `--dev` switch:
```bash
textual run my_app.py --dev
```
You should notice that the console will display information regarding the running application, such as events which are sent.
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)`.