Use sys.executable

Python command may not be "python".

python/pyarrow/tests/test_plasma.py

@@ -1086,8 +1086,8 @@ def test_plasma_list():
 @pytest.mark.plasma
 def test_object_id_randomness():
     cmd = "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
-    first_object_id = subprocess.check_output(["python", "-c", cmd])
-    second_object_id = subprocess.check_output(["python", "-c", cmd])
+    first_object_id = subprocess.check_output([sys.executable, "-c", cmd])
+    second_object_id = subprocess.check_output([sys.executable, "-c", cmd])
     assert first_object_id != second_object_id
 
 

python/pyarrow/tests/test_serialization.py

@@ -917,7 +917,7 @@ def test_deserialize_components_in_different_process():
     subprocess_env = test_util.get_modified_env_with_pythonpath()
     print("** sys.path =", sys.path)
     print("** setting PYTHONPATH to:", subprocess_env['PYTHONPATH'])
-    subprocess.check_call(["python", "-c", code], env=subprocess_env)
+    subprocess.check_call([sys.executable, "-c", code], env=subprocess_env)
 
 
 def test_serialize_read_concatenated_records():