# libtmux.Pane.from_env

- **Module:** libtmux.Pane
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/036c521c4b83ce6e434eb50afe2a0d08a6a05e46/src/libtmux/pane.py#L227
- **Page:** https://libtmux.org/reference/py/libtmux-pane-from_env/

```
libtmux.Pane.from_env(cls, env: t.Mapping[str, str] | None = None) -> Pane
```

Return the pane this process is running inside of.

Reads ``$TMUX`` for the server's socket and ``$TMUX_PANE`` for the pane
id, then asks tmux for the rest. The stale session id inside ``$TMUX``
is never consulted, so the answer stays correct after the pane's window
has been moved or linked elsewhere.

## Parameters

- `cls`
- `env` (t.Mapping[str, str] | None) — Environment to read. Defaults to :data:`os.environ`, which is what
a process running inside a pane wants; pass an explicit mapping to
resolve on behalf of another pane.

## Returns

:class:`Pane`

## Raises

- `NotInsideTmux` — When ``$TMUX`` or ``$TMUX_PANE`` is unset or malformed.
- `TmuxObjectDoesNotExist` — When the pane named by ``$TMUX_PANE`` is gone.
- `LibTmuxException` — When the server named by ``$TMUX`` is unreachable.

## Example

```python
>>> socket_path = server.cmd(  # doctest: +HIDE
...     "display-message", "-p", "-t", pane.pane_id, "#{socket_path}"
... ).stdout[0]
>>> env = {  # doctest: +HIDE
...     "TMUX": f"{socket_path},1,0",
...     "TMUX_PANE": pane.pane_id,
... }
```

## Example

```python
>>> Pane.from_env(env)
Pane(%1 Window(@1 1:..., Session($1 ...)))
```

## Example

```python
>>> Pane.from_env(env).pane_id == pane.pane_id
True
```

## Example

Outside a pane there is nothing to resolve:

```python
>>> from libtmux import exc
>>> try:
...     Pane.from_env({})
... except exc.NotInsideTmux as e:
...     print(e)
Not inside a tmux pane: $TMUX is unset or empty
```