switch from uv run python to sys.executable

To ensure that the same python interpreter is used to spawn pytask as is
running the test we currently rely on `uv` to spawn the instance of
python. This relies on us having spawned the test process from `uv` in
the first place and requires that `uv` be used by anyone attempting to
test the software.

This switches the pattern `uv run python` to call
(`sys.executable`)[https://docs.python.org/3/library/sys.html#sys.executable]
which gives the absolute path of the interpreter being used.

Author: erooke

tests/test_capture.py

@@ -87,7 +87,7 @@ def task_show_capture():
     """
     tmp_path.joinpath("workflow.py").write_text(textwrap.dedent(source))
 
-    result = run_in_subprocess(("uv", "run", "python", "workflow.py"), cwd=tmp_path)
+    result = run_in_subprocess((sys.executable, "workflow.py"), cwd=tmp_path)
 
     assert result.exit_code == ExitCode.FAILED
 
@@ -128,7 +128,7 @@ def test_wrong_capture_method(tmp_path):
     """
     tmp_path.joinpath("workflow.py").write_text(textwrap.dedent(source))
 
-    result = run_in_subprocess(("uv", "run", "python", "workflow.py"), cwd=tmp_path)
+    result = run_in_subprocess((sys.executable, "workflow.py"), cwd=tmp_path)
     assert result.exit_code == ExitCode.CONFIGURATION_FAILED
     assert "Value 'a' is not a valid" in result.stdout
     assert "Traceback" not in result.stdout
@@ -255,7 +255,7 @@ def task_unicode():
     tmp_path.joinpath("workflow.py").write_text(
         textwrap.dedent(source), encoding="utf-8"
     )
-    result = run_in_subprocess(("uv", "run", "python", "workflow.py"), cwd=tmp_path)
+    result = run_in_subprocess((sys.executable, "workflow.py"), cwd=tmp_path)
     assert result.exit_code == ExitCode.OK
     assert "1  Succeeded" in result.stdout
 

tests/test_config.py

@@ -114,7 +114,7 @@ def test_paths_are_relative_to_configuration_file(tmp_path):
     session = build(paths=[Path("src")])
     """
     tmp_path.joinpath("script.py").write_text(textwrap.dedent(source))
-    result = run_in_subprocess(("uv", "run", "python", "script.py"), cwd=tmp_path)
+    result = run_in_subprocess((sys.executable, "script.py"), cwd=tmp_path)
     assert result.exit_code == ExitCode.OK
     assert "1  Succeeded" in result.stdout
 

tests/test_dag_command.py

@@ -92,7 +92,7 @@ def main():
     tmp_path.joinpath("input.txt").touch()
 
     result = subprocess.run(
-        ("uv", "run", "python", "task_example.py"),
+        (sys.executable, "task_example.py"),
         cwd=tmp_path,
         check=True,
         capture_output=True,

tests/test_execute.py

@@ -26,7 +26,7 @@
 def test_python_m_pytask(tmp_path):
     tmp_path.joinpath("task_module.py").write_text("def task_example(): pass")
     result = run_in_subprocess(
-        ("uv", "run", "python", "-m", "pytask", tmp_path.as_posix())
+        (sys.executable, "-m", "pytask", tmp_path.as_posix())
     )
     assert result.exit_code == ExitCode.OK
 
@@ -602,7 +602,7 @@ def create_file(
     """
     tmp_path.joinpath("task_module.py").write_text(textwrap.dedent(source))
     result = subprocess.run(
-        ("uv", "run", "python", tmp_path.joinpath("task_module.py").as_posix()),
+        (sys.executable, tmp_path.joinpath("task_module.py").as_posix()),
         check=False,
     )
     assert result.returncode == ExitCode.OK
@@ -632,7 +632,7 @@ def task2() -> None: pass
     """
     tmp_path.joinpath("task_module.py").write_text(textwrap.dedent(source))
     result = run_in_subprocess(
-        ("uv", "run", "python", tmp_path.joinpath("task_module.py").as_posix())
+        (sys.executable, tmp_path.joinpath("task_module.py").as_posix())
     )
     assert result.exit_code == ExitCode.OK
 

tests/test_hook_module.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import subprocess
+import sys
 import textwrap
 
 import pytest
@@ -25,9 +26,7 @@ def pytask_extend_command_line_interface(cli):
 
     if module_name:
         args = (
-            "uv",
-            "run",
-            "python",
+            sys.executable,
             "-m",
             "pytask",
             "build",
@@ -70,10 +69,7 @@ def pytask_extend_command_line_interface(cli):
 
     if module_name:
         args = (
-            "uv",
-            "run",
-            "--no-project",
-            "python",
+            sys.executable,
             "-m",
             "pytask",
             "build",

tests/test_task.py

@@ -667,7 +667,7 @@ def task_second():
     tmp_path.joinpath("task_example.py").write_text(textwrap.dedent(source))
 
     result = subprocess.run(
-        ("uv", "run", "python", "task_example.py"),
+        (sys.executable, "task_example.py"),
         cwd=tmp_path,
         capture_output=True,
         check=False,