# libtmux.Server.lock_client

- **Module:** libtmux
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/38e368c11117fb4aeb2f082d552cd4f210eae06a/src/libtmux/server.py#L982
- **Page:** https://libtmux.org/en/py/stable/reference/libtmux-server-lock_client/

tmux command: [`lock-client`](/en/tmux/latest/manual/lock-client/)

```
libtmux.Server.lock_client(
    self, target_client: str | None = None
) -> None
```

Lock a client via [`$ tmux lock-client`](/en/tmux/latest/manual/lock-client/).

Requires an attached client.

## Examples

```python
>>> with control_mode() as ctl:
...     server.lock_client()
```

## Parameters

- `target_client` (`str | None`): Target client (``-t`` flag).

## In other ports

### Lock one client

- Go: [`tmux.Server.LockClient`](/en/go/latest/reference/tmux-server-lockclient/) (method)
- C#: [`LibTmux.Server.LockClientAsync`](/en/csharp/latest/reference/libtmux-server-lockclientasync/) (method)