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