# libtmux.Server.attach_session

- **Module:** libtmux
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/38e368c11117fb4aeb2f082d552cd4f210eae06a/src/libtmux/server.py#L2180
- **Page:** https://libtmux.org/en/py/stable/reference/libtmux-server-attach_session/

```
libtmux.Server.attach_session(
    self, target_session: str | None = None
) -> None
```

Attach tmux session.

## Parameters

- `target_session` (`str | None`): name of the session. fnmatch(3) works.

## Raises

- [`exc.BadSessionName`](/en/py/stable/reference/libtmux-exc-badsessionname/)