When working on a project, it is installed into the virtual environment at .venv. This environment is isolated from the current shell by default, so invocations that require the project, e.g., python -c "import example", will fail. Instead, use uv run to run commands in the project environment:
$ uv run python -c "import example"
When using run, uv will ensure that the project environment is up-to-date before running the given command.
The given command can be provided by the project environment or exist outside of it, e.g.:
$ # Presuming the project provides `example-cli`
$ uv run example-cli foo
$ # Running a `bash` script that requires the project to be available
$ uv run bash scripts/foo.sh
Additional dependencies or different versions of dependencies can be requested per invocation.
The --with option is used to include a dependency for the invocation, e.g., to request a different version of httpx:
$ uv run --with httpx==0.26.0 python -c "import httpx; print(httpx.__version__)"
0.26.0
$ uv run --with httpx==0.25.0 python -c "import httpx; print(httpx.__version__)"
0.25.0
The requested version will be respected regardless of the project's requirements. For example, even if the project requires httpx==0.24.0, the output above would be the same.
Scripts that declare inline metadata are automatically executed in environments isolated from the project. See the scripts guide for more details.
For example, given a script:
example.py# /// script
# dependencies = [
# "httpx",
# ]
# ///
import httpx
resp = httpx.get("https://peps.python.org/api/peps.json")
data = resp.json()
print([(k, v["title"]) for k, v in data.items()][:10])
The invocation uv run example.py would run isolated from the project with only the given dependencies listed.
Support is provided for legacy setuptools scripts. These types of scripts are additional files installed by setuptools in .venv\Scripts.
Currently only legacy scripts with the .ps1, .cmd, and .bat extensions are supported.
For example, below is an example running a Command Prompt script.
$ uv run --with nuitka==2.6.7 -- nuitka.cmd --version
In addition, you don't need to specify the extension. uv will automatically look for files ending in .ps1, .cmd, and .bat in that order of execution on your behalf.
$ uv run --with nuitka==2.6.7 -- nuitka --version
uv does not cede control of the process to the spawned command in order to provide better error messages on failure. Consequently, uv is responsible for forwarding some signals to the child process the requested command runs in.
On Unix systems, uv will forward SIGINT and SIGTERM to the child process. Since terminals send SIGINT to the foreground process group on Ctrl-C, uv will only forward a SIGINT to the child process if it is sent more than once or the child process group differs from uv's.
On Windows, these concepts do not apply and uv ignores Ctrl-C events, deferring handling to the child process so it can exit cleanly.
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