parametrize test

Author: jbrockmendel

pandas/core/computation/pytables.py

@@ -230,11 +230,9 @@ def stringify(value):
                 conv_val = conv_val.tz_convert("UTC")
             return TermValue(conv_val, conv_val._value, kind)
         elif kind.startswith("timedelta"):
-            # TODO: other timedelta64 units? 2025-11-30 only
-            #  test_append_with_timedelta gets here
             unit = "ns"
             if "[" in kind:
-                unit = cast("TimeUnit", kind[-3:-1])
+                unit = cast("TimeUnit", kind.split("[")[-1][:-1])
             if isinstance(conv_val, str):
                 conv_val = Timedelta(conv_val)
             elif lib.is_integer(conv_val) or lib.is_float(conv_val):

pandas/tests/io/pytables/test_append.py

@@ -848,7 +848,7 @@ def test_append_raise(tmp_path, using_infer_string):
             store.append("df", df)
 
 
-def test_append_with_timedelta(tmp_path):
+def test_append_with_timedelta(tmp_path, unit):
     # GH 3577
     # append timedelta
 
@@ -860,6 +860,7 @@ def test_append_with_timedelta(tmp_path):
         }
     )
     df["C"] = df["A"] - df["B"]
+    df["C"] = df["C"].astype(f"m8[{unit}]")
     df.loc[3:5, "C"] = np.nan
 
     path = tmp_path / "test_append_with_timedelta.h5"