Deprecate numeric type python version in PythonVirtualEnvOperator

airflow/operators/python.py

@@ -531,7 +531,7 @@ def __init__(
         *,
         python_callable: Callable,
         requirements: None | Iterable[str] | str = None,
-        python_version: str | int | float | None = None,
+        python_version: str | None = None,
         use_dill: bool = False,
         system_site_packages: bool = True,
         pip_install_options: list[str] | None = None,
@@ -555,6 +555,13 @@ def __init__(
                 "major versions for PythonVirtualenvOperator. Please use string_args."
                 f"Sys version: {sys.version_info}. Venv version: {python_version}"
             )
+        if python_version is not None and not isinstance(python_version, str):
+            warnings.warn(
+                "Passing non-string types (e.g. int or float) as python_version "
+                "is deprecated. Please use string value instead.",
+                RemovedInAirflow3Warning,
+                stacklevel=2,
+            )
         if not is_venv_installed():
             raise AirflowException("PythonVirtualenvOperator requires virtualenv, please install it.")
         if not requirements:

tests/operators/test_python.py

@@ -965,7 +965,7 @@ def f():
                 return
             raise Exception
 
-        self.run_as_task(f, python_version=3, use_dill=False, requirements=["dill"])
+        self.run_as_task(f, python_version="3", use_dill=False, requirements=["dill"])
 
     def test_without_dill(self):
         def f(a):