Project metadata: Remove setup.py. Improve Python compatibility.

devtools/create_tag.sh

@@ -48,7 +48,7 @@ fi
 
 # check if tag to create has already been created
 WORKING_DIR=`dirname $0`
-VERSION=`python setup.py --version`
+VERSION=`hatch project metadata version`
 EXISTS=`git tag | grep $VERSION`
 
 if [ "$VERSION" == "$EXISTS" ]

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["hatchling >= 1.26", "versioningit"]
+requires = ["hatchling", "versioningit"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.sdist]
@@ -26,7 +26,7 @@ name = "crate"
 dynamic = ["version"]
 description = "CrateDB Python Client"
 authors = [{ name = "Crate.io", email = "[email protected]" }]
-requires-python = ">=3.10"
+requires-python = ">=3.6"
 readme = "README.rst"
 license = "Apache-2.0"
 classifiers = [
@@ -42,25 +42,29 @@ classifiers = [
         "Programming Language :: Python :: 3.14",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
+        "Programming Language :: SQL",
         "Topic :: Database",
+        "Topic :: Internet :: WWW/HTTP",
+        "Topic :: Scientific/Engineering :: Interface Engine/Protocol Translator",
+        "Topic :: System :: Networking",
 ]
 dependencies = [
     "importlib-metadata; python_version<'3.8'",
-    "orjson>=3.11.3",
+    "orjson",
     "urllib3",
     "verlib2>=0.3.1",
 ]
 
 [dependency-groups]
 dev = [
-    "certifi>=2025.10.5",
+    "backports.zoneinfo<1; python_version<'3.9'",
+    "certifi",
     "coverage<8",
     "mypy<1.20",
     "poethepoet<1",
     "pytest<10",
-    "pytz>=2025.2",
+    "pytz",
     "ruff<0.15",
-    "setuptools>=80.9.0",
     "stopit<1.2",
 ]
 

requirements.txt

@@ -1,3 +1,3 @@
 zc.buildout==5.1.1
-zope.interface==8.1.1
+zope.interface>=8
 zope.testrunner>=5,<9

src/crate/client/cursor.py

@@ -221,6 +221,8 @@ def duration(self):
     def _convert_rows(self):
         """
         Iterate rows, apply type converters, and generate converted rows.
+
+        The converter is only supported on Python >= 3.10.
         """
         if not ("col_types" in self._result and self._result["col_types"]):
             raise ValueError(
@@ -238,7 +240,7 @@ def _convert_rows(self):
         for row in self._result["rows"]:
             yield [
                 convert(value)
-                for convert, value in zip(converters, row, strict=False)
+                for convert, value in zip(converters, row, strict=False)  # type: ignore[call-overload]
             ]
 
     @property

tests/client/test_cursor.py

@@ -20,6 +20,7 @@
 # software solely pursuant to the terms of the relevant commercial agreement.
 
 import datetime
+import sys
 from ipaddress import IPv4Address
 from unittest import mock
 
@@ -58,6 +59,9 @@ def test_cursor_fetch(mocked_connection):
         ]
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Test needs Python >= 3.10"
+)
 def test_cursor_description(mocked_connection):
     cursor = mocked_connection.cursor()
     response = {
@@ -249,6 +253,9 @@ def test_execute_with_bulk_args(mocked_connection):
     mocked_connection.client.sql.assert_called_once_with(statement, None, [[1]])
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_execute_custom_converter(mocked_connection):
     """
     Verify that a custom converter is correctly applied when passed to a cursor.
@@ -299,6 +306,9 @@ def test_execute_custom_converter(mocked_connection):
         ]
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_execute_with_converter_and_invalid_data_type(mocked_connection):
     converter = DefaultTypeConverter()
 
@@ -323,6 +333,9 @@ def test_execute_with_converter_and_invalid_data_type(mocked_connection):
             assert e.exception.args == "999 is not a valid DataType"
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_execute_array_with_converter(mocked_connection):
     converter = DefaultTypeConverter()
     cursor = mocked_connection.cursor(converter=converter)
@@ -345,6 +358,9 @@ def test_execute_array_with_converter(mocked_connection):
         ]
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_execute_array_with_converter_invalid(mocked_connection):
     converter = DefaultTypeConverter()
     cursor = mocked_connection.cursor(converter=converter)
@@ -368,6 +384,9 @@ def test_execute_array_with_converter_invalid(mocked_connection):
             )
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_execute_nested_array_with_converter(mocked_connection):
     converter = DefaultTypeConverter()
     cursor = mocked_connection.cursor(converter=converter)
@@ -405,6 +424,9 @@ def test_execute_nested_array_with_converter(mocked_connection):
         ]
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_executemany_with_converter(mocked_connection):
     converter = DefaultTypeConverter()
     cursor = mocked_connection.cursor(converter=converter)
@@ -426,6 +448,9 @@ def test_executemany_with_converter(mocked_connection):
         assert result == []
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 10), reason="Converter needs Python >= 3.10"
+)
 def test_execute_with_timezone(mocked_connection):
     # Create a `Cursor` object with `time_zone`.
     tz_mst = datetime.timezone(datetime.timedelta(hours=7), name="MST")

tests/client/tests.py

@@ -1,4 +1,5 @@
 import doctest
+import sys
 import unittest
 
 from .layer import (
@@ -18,14 +19,17 @@ def test_suite():
     suite.addTest(doctest.DocTestSuite("crate.client.connection"))
     suite.addTest(doctest.DocTestSuite("crate.client.http"))
 
-    s = doctest.DocFileSuite(
-        "docs/by-example/connection.rst",
-        "docs/by-example/cursor.rst",
-        module_relative=False,
-        optionflags=flags,
-        encoding="utf-8",
-    )
-    suite.addTest(s)
+    if sys.version_info >= (3, 10):
+        # This suite includes converter tests,
+        # which are only available with Python 3.10 and newer.
+        s = doctest.DocFileSuite(
+            "docs/by-example/connection.rst",
+            "docs/by-example/cursor.rst",
+            module_relative=False,
+            optionflags=flags,
+            encoding="utf-8",
+        )
+        suite.addTest(s)
 
     s = doctest.DocFileSuite(
         "docs/by-example/https.rst",