Fix progress output in non-interactive shells

Co-authored-by: Codex <noreply@anthropic.com>

Author: aryasalem09

src/parcels/_core/particleset.py

@@ -420,6 +420,7 @@ def execute(
             pbar = tqdm(
                 total=sign_dt * (end_time - start_time),
                 file=sys.stdout,
+                disable=None,
                 bar_format="{desc} {percentage:3.0f}%|{bar}| [{elapsed}<{remaining}, {rate_fmt}]",
             )
             pbar.set_description_str(

tests/test_particleset.py

@@ -1,3 +1,4 @@
+import sys
 from contextlib import nullcontext as does_not_raise
 from datetime import datetime, timedelta
 from operator import attrgetter
@@ -33,6 +34,23 @@ def test_create_empty_pset(fieldset):
     assert pset.size == 0
 
 
+@pytest.mark.parametrize(
+    ("is_tty", "expect_progress"),
+    [(True, True), (False, False)],
+)
+def test_pset_execute_progress_respects_stdout_tty(fieldset, monkeypatch, capsys, is_tty, expect_progress):
+    monkeypatch.setattr(sys.stdout, "isatty", lambda: is_tty)
+    pset = ParticleSet(fieldset, x=0, y=0, pclass=Particle)
+
+    pset.execute(
+        DoNothing,
+        runtime=np.timedelta64(1, "s"),
+        dt=np.timedelta64(1, "s"),
+    )
+
+    assert bool(capsys.readouterr().out) is expect_progress
+
+
 @pytest.mark.parametrize("offset", [0, 1, 200])
 def test_pset_with_pids(fieldset, offset, npart=100):
     lon = np.linspace(0, 1, npart)