fix pandas futurewarnings without pinning pandas (#634)

Author: stevebachmeier

CHANGELOG.rst

@@ -1,3 +1,7 @@
+**3.4.9 - 07/31/25**
+
+  - Modify futurewarning fix from v3.4.7 to not require pandas>=2.2.0
+
 **3.4.8 - 07/25/25**
 
   - Feature: Support new environment creation via 'make build-env'

setup.py

@@ -44,7 +44,7 @@
         "vivarium_build_utils>=2.0.1,<3.0.0",
         "layered_config_tree>=2.1.0",
         "numpy<2.0.0",
-        "pandas>=2.2.0",
+        "pandas",
         "pyyaml>=5.1",
         "scipy",
         "click",

src/vivarium/framework/results/observation.py

@@ -340,7 +340,7 @@ def _aggregate(
         aggregates = (
             pop_groups[aggregator_sources].apply(aggregator).fillna(0.0)  # type: ignore [arg-type]
             if aggregator_sources
-            else pop_groups.apply(aggregator, include_groups=False)  # type: ignore [arg-type]
+            else pop_groups[pop_groups.obj.columns].apply(aggregator)  # type: ignore [arg-type]
         ).astype(float)
         return aggregates