fix: look for uv next to python if it's not on PATH

nox/virtualenv.py

@@ -39,6 +39,22 @@
 _SYSTEM = platform.system()
 
 
+def find_uv() -> str | None:
+ uv = shutil.which("uv")
+ if uv is not None:
+ return uv
+
+ # Handle `pipx install nox[uv]` by looking for uv next to python.
+ uv = os.path.join(os.path.dirname(sys.executable), "uv")
+ if os.path.exists(uv):
+ return uv
+
+ return None
+
+
+UV = find_uv()
+
+
 class InterpreterNotFound(OSError):
  def __init__(self, interpreter: str) -> None:
  super().__init__(f"Python interpreter {interpreter} not found")
@@ -524,7 +540,7 @@ def create(self) -> bool:
  cmd.extend(["-p", self._resolved_interpreter])
  elif self.venv_backend == "uv":
  cmd = [
- "uv",
+ UV or "uv",
  "venv",
  "-p",
  self._resolved_interpreter if self.interpreter else sys.executable,
@@ -560,5 +576,5 @@ def create(self) -> bool:
 OPTIONAL_VENVS = {
  "conda": shutil.which("conda") is not None,
  "mamba": shutil.which("mamba") is not None,
- "uv": shutil.which("uv") is not None,
+ "uv": UV is not None,
 }