# libtmux.Session.refresh

- **Module:** libtmux.Session
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/9fdd083a8181a827889337b63cd4e6daea661a8c/src/libtmux/session.py#L149
- **Page:** https://libtmux.org/en/py/latest/reference/libtmux-session-refresh/

```
libtmux.Session.refresh(self) -> None
```

Refresh session attributes from tmux.

## Raises

- `ValueError`: When ``session_id`` is unset. Surfaces a clear error under
``python -O``, where an ``assert`` would be stripped.