Revert change in minimum pandas version

Author: markcampanelli

benchmarks/asv.conf.json

@@ -116,7 +116,7 @@
             "python": "3.9",
             "build": "",
             "numpy": "1.19.5",
-            "pandas": "1.4.0",
+            "pandas": "1.3.0",
             "scipy": "1.6.0",
             // Note: these don't have a minimum in setup.py
             "h5py": "3.1.0",

ci/requirements-py3.10.yml

@@ -9,7 +9,7 @@ dependencies:
     - h5py
     - numba
     - numpy >= 1.17.3
-    - pandas >= 1.4.0
+    - pandas >= 1.3.0
     - pip
     - pytest
     - pytest-cov

ci/requirements-py3.11.yml

@@ -9,7 +9,7 @@ dependencies:
     - h5py
     - numba
     - numpy >= 1.17.3
-    - pandas >= 1.4.0
+    - pandas >= 1.3.0
     - pip
     - pytest
     - pytest-cov

ci/requirements-py3.12.yml

@@ -9,7 +9,7 @@ dependencies:
     - h5py
     - numba
     - numpy >= 1.17.3
-    - pandas >= 1.4.0
+    - pandas >= 1.3.0
     - pip
     - pytest
     - pytest-cov

ci/requirements-py3.9-min.yml

@@ -14,7 +14,7 @@ dependencies:
     - pip:
         - h5py==3.0.0
         - numpy==1.19.3
-        - pandas==1.4.0  # min version of pvlib
+        - pandas==1.3.0  # min version of pvlib
         - scipy==1.6.0
         - pytest-rerunfailures # conda version is >3.6
         - pytest-remotedata # conda package is 0.3.0, needs > 0.3.1

ci/requirements-py3.9.yml

@@ -9,7 +9,7 @@ dependencies:
     - h5py
     - numba
     - numpy >= 1.17.3
-    - pandas >= 1.4.0
+    - pandas >= 1.3.0
     - pip
     - pytest
     - pytest-cov

docs/sphinx/source/whatsnew/v0.11.3.rst

@@ -23,7 +23,6 @@ Testing
 
 Requirements
 ~~~~~~~~~~~~
-* Minimum version of pandas advanced from 1.3.0 to 1.4.0. (:pull:`2341`)
 
 
 Contributors

pvlib/tests/test_tools.py

@@ -275,11 +275,12 @@ def test_localize_to_utc(input, expected):
     got = tools.localize_to_utc(**input)
 
     if isinstance(got, (pd.Series, pd.DataFrame)):
-        # Older pandas versions have wonky dtype check on index.
+        # Older pandas versions have wonky dtype equality check on timestamp
+        # index, so check the values as numpy.ndarray and indices one by one.
+        np.testing.assert_array_equal(got.to_numpy(), expected.to_numpy())
+
         for index_got, index_expected in zip(got.index, expected.index):
             assert index_got == index_expected
-
-        np.testing.assert_array_equal(got.to_numpy(), expected.to_numpy())
     else:
         assert got == expected
 

pyproject.toml

@@ -12,7 +12,7 @@ authors = [
 requires-python = ">=3.9"
 dependencies = [
     'numpy >= 1.19.3',
-    'pandas >= 1.4.0',
+    'pandas >= 1.3.0',
     'pytz',
     'requests',
     'scipy >= 1.6.0',