fix: dump subprocesses python versions

src/taskgraph/run-task/run-task

@@ -1033,6 +1033,23 @@ def _display_python_version():
         b"setup", b"Python version: %s\n" % platform.python_version().encode("utf-8")
     )
 
+def _display_subprocess_python_version():
+
+    python_versions = ["python","python3"]
+
+    for python_executable in python_versions:
+        try:
+            version = subprocess.check_output(
+                [python_executable, "-c", "import platform; print(platform.python_version())"],
+            ).strip()
+
+            print_line(
+                b"setup", b"Subprocess %s version: %s\n" % (python_executable.encode(), version)
+            )
+
+        except FileNotFoundError:
+            pass
+
 
 def main(args):
     task_workdir = os.environ["TASK_WORKDIR"] = os.getcwd()
@@ -1045,6 +1062,7 @@ def main(args):
         b"Invoked by command: %s\n" % " ".join(args).encode("utf-8"),
     )
     _display_python_version()
+    _display_subprocess_python_version()
     running_as_root = IS_POSIX and os.getuid() == 0
 
     # Arguments up to '--' are ours. After are for the main task

test/test_scripts_run_task.py

@@ -438,6 +438,18 @@ def test_display_python_version_should_output_python_versions(run_task_mod, caps
     assert ("Python version: 3." in output) or ("Python version: 2." in output) is True
 
 
+def test_display_subprocess_python_version_should_output_python_versions_title(
+    run_task_mod, capsys
+):
+    run_task_mod._display_subprocess_python_version()
+
+    assert (
+        ("Subprocess python3 version:" in capsys.readouterr().out)
+        or ("Subprocess python2 version:" in capsys.readouterr().out)
+        or ("Subprocess python version:" in capsys.readouterr().out) is True
+    )
+
+
 @pytest.fixture
 def run_main(tmp_path, mocker, mock_stdin, run_task_mod):
     base_args = [