'SimpleApp' object has no attribute 'view'

[keflag]

Excuse me, this is a example on wiki:

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


class SimpleApp(App):
    async def on_mount(self, event: events.Mount) -> None:
        await self.view.dock(Placeholder(), edge="left", size=40)
        await self.view.dock(Placeholder(), Placeholder(), edge="top")

app = SimpleApp()
app.run()

but when i run it, debugger shows that

╭────────────────── Traceback (most recent call last) ───────────────────╮
│ C:\xxxxxxxx\main.py:9 in on_mount                                      │
│                                                                        │
│    6 class SimpleApp(App):                                             │
│    7 │                                                                 │
│    8 │   async def on_mount(self, event: events.Mount) -> None:        │
│ ❱  9 │   │   await self.view.dock(Placeholder(), edge="left", size=40) │
│   10 │   │   await self.view.dock(Placeholder(), Placeholder(), edge=" │
│   11                                                                   │
│   12                                                                   │
│                                                                        │
│ ╭─────────────────────────── locals ───────────────────────────╮       │
│ │ event = Mount()                                              │       │
│ │  self = SimpleApp(title='SimpleApp', classes={'-dark-mode'}) │       │
│ ╰──────────────────────────────────────────────────────────────╯       │
╰────────────────────────────────────────────────────────────────────────╯
AttributeError: 'SimpleApp' object has no attribute 'view'

NOTE: 1 of 2 errors shown. Run with --dev to see all errors.

what can i do to fix it, or is it a bug or a wrong example on the wiki?

[davep]

That looks like very old Textual code. When you say it's from an example on "the wiki", could you please point us to it? We don't maintain a wiki.

[davep]

@AmbitiousDragon It's been a wee while since you asked, are you still having an issue?