fix #295

.github/workflows/runtests.yml

@@ -100,7 +100,7 @@ jobs:
         shell: bash -l {0}
         if: matrix.os == 'macos-latest'
         run: |
-          python -m pip install --upgrade --no-deps --force-reinstall tables
+          python -m pip install --upgrade --force-reinstall tables
 
       # Runs test suite and calculates coverage
       - name: run test suite

dascore/core/spool.py

@@ -561,11 +561,12 @@ def __init__(self, data: PatchType | Sequence[PatchType] | None = None):
     def __rich__(self):
         base = super().__rich__()
         df = self._df
-        t1, t2 = df["time_min"].min(), df["time_max"].max()
-        tmin = get_nice_text(t1)
-        tmax = get_nice_text(t2)
-        duration = get_nice_text(t2 - t1)
-        base += Text(f"\n    Time Span: <{duration}> {tmin} to {tmax}")
+        if len(df):
+            t1, t2 = df["time_min"].min(), df["time_max"].max()
+            tmin = get_nice_text(t1)
+            tmax = get_nice_text(t2)
+            duration = get_nice_text(t2 - t1)
+            base += Text(f"\n    Time Span: <{duration}> {tmin} to {tmax}")
         return base
 
     def _load_patch(self, kwargs) -> Self:

tests/test_core/test_spool.py

@@ -52,6 +52,12 @@ def test_updated_spool_eq(self, random_spool):
         """Ensure updating the spool doesnt change equality."""
         assert random_spool == random_spool.update()
 
+    def test_empty_spool_str(self):
+        """Ensure and empty spool has a string rep. See #295."""
+        spool = dc.spool([])
+        spool_str = str(spool)
+        assert "Spool" in spool_str
+
 
 class TestSpoolEquals:
     """Tests for spool equality."""