# Double bind outcome

**🟢 Beginner · Lesson 30**

Binding the SAME class twice is refused - a spell_id is the SHA256 of the class's code, and one object registers once, under any binding name or lifecycle. When one shape must serve two roles, make two shapes: subclass it (see 24).

## Before you run

Use the [Beginner guide](../../beginner/index.md) for prerequisite concepts. Run from a checkout with Melder installed and Python 3.14 free-threading selected. The collection download includes the level's local helper modules.

## Run the saved script

```bash
python UX_and_AIX_experiences/01_beginner/30_double_bind_outcome.py
```

```powershell
py -3.14t UX_and_AIX_experiences/01_beginner/30_double_bind_outcome.py
```

{download}`Download this collection <../../downloads/beginner-examples.zip>` · [Source on GitHub](https://github.com/Synaptic724/melder/blob/90d52e0a12cb0743d62568d5a19ce954a54443bc/UX_and_AIX_experiences/01_beginner/30_double_bind_outcome.py)

## Public surface

the one-object law at bind time

## Code

```{literalinclude} ../../downloads/01_beginner/30_double_bind_outcome.py
:language: python
:linenos:
```

## Check the outcome

The script contains its own assertions or demonstrated refusal paths. Run it to evaluate those checks against your installed version. The code above is taken directly from the saved file; no run output is invented here.

[More beginner examples](index.md) · [Level guide](../../beginner/index.md)

## Related guides

- [Understand errors and refusals](../../beginner/errors.md)