# libtmux.Session.unset_environment

- **Module:** libtmux
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/38e368c11117fb4aeb2f082d552cd4f210eae06a/src/libtmux/common.py#L117
- **Inherited from:** libtmux.common.EnvironmentMixin
- **Page:** https://libtmux.org/en/py/stable/reference/libtmux-session-unset_environment/

```
libtmux.Session.unset_environment(self, name: str) -> None
```

Unset environment variable [`$ tmux set-environment -u <name>`](/en/tmux/latest/manual/set-environment/).

## Parameters

- `name` (`str`): The environment variable name, e.g. 'PATH'.

## Raises

- [`ValueError`](https://docs.python.org/3/library/exceptions.html#ValueError): If tmux returns an error.

## In other ports

### Unset a variable in a session's environment

- Ruby: [`LibTmux::Session#unset_environment`](/en/ruby/latest/reference/libtmux-session-unset_environment/) (method)
- Lua: [`libtmux.Session:unset_environment`](/en/lua/latest/reference/libtmux-session-unset_environment/) (method)
- TypeScript: [`session.Session.unsetEnvironment`](/en/ts/latest/reference/session-session-unsetenvironment/) (method)
- Rust: [`session.Session.unset_environment`](/en/rs/latest/reference/session-session-unset_environment/) (method)
- Go: [`tmux.Session.UnsetEnvironment`](/en/go/latest/reference/tmux-session-unsetenvironment/) (method)
- Swift: [`Server.unsetEnvironment(_:in:)`](/en/swift/latest/reference/server-unsetenvironment(_-in-)/) (method)