# Scopes that nest

<sub>**Beginner.** Child scopes, no configuration.</sub>

```python
import melder as md


class Config:
    """Shared configuration for this example."""


class Session:
    """State scoped to one conduit."""


book = md.Spellbook()
book.bind(spell=Config, existence="unique")
book.bind(spell=Session, existence="unique_per_conduit")

with book.conjure() as root:
    with root.enter_lesser_conduit() as child:
        assert root.meld("Config") is child.meld("Config")       # shared
        assert root.meld("Session") is not child.meld("Session") # per-scope
```

Expected outcome: both assertions pass, with no printed output. The child scope
ends first, then the root; a child does not create another book or another root.

## Runnable examples

- [Lesser conduit scopes](../examples/beginner/05-lesser-conduit-scopes.md) — Beginner 05
- [Pass the conduit around](../examples/beginner/27-pass-the-conduit-around.md) — Beginner 27
- [Scope contrast one tree](../examples/beginner/34-scope-contrast-one-tree.md) — Beginner 34

[All beginner examples](../examples/beginner/index.md) · [Level contents](index.md) · [Full contents](../contents.md)

[Canonical page source](https://github.com/Synaptic724/melder/blob/90d52e0a12cb0743d62568d5a19ce954a54443bc/README.md)