Drop Python 3.9 (#956)

Author: jacopoabramo

.github/workflows/ci.yml

@@ -56,7 +56,6 @@ jobs:
         # - windows-latest
         # - macos-latest
         python-version:
-        - "3.9"
         - "3.10"
         - "3.11"
         - "3.12"

.pytest.ini

@@ -3,8 +3,6 @@ extend-exclude = [
   "src/msgspec/_version.py",
   "tests/typing/basic_typing_examples.py",
   "tests/unit/test_JSONTestSuite.py",
-  # TODO: remove when this when we drop support for Python 3.9 (example uses match statements)
-  "examples/asyncio-kv/kv.py",
 ]
 
 [lint]

.ruff.toml

@@ -1,9 +1,10 @@
 from __future__ import annotations
 
 import asyncio
-import msgspec
 from typing import Any
 
+import msgspec
+
 
 # Some utilities for writing and reading length-prefix framed messages. Using
 # length-prefixed framing makes it easier for the reader to determine the

examples/asyncio-kv/kv.py

@@ -16,7 +16,7 @@ license = "BSD-3-Clause"
 license-files = [
   "LICENSE",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 maintainers = [
   { name = "Jim Crist-Harif", email = "jcristharif@gmail.com" },
   { name = "Ofek Lev", email = "oss@ofek.dev" },
@@ -33,7 +33,6 @@ keywords = [
 ]
 classifiers = [
   "Development Status :: 4 - Beta",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -85,8 +84,7 @@ hooks = [
   "ruff==0.14.1",
 ]
 test-base = [
-  # TODO: require >=9 once we drop support for Python 3.9
-  "pytest>=8",
+  "pytest>=9",
 ]
 test-prof = [
   { include-group = "test-base" },
@@ -103,7 +101,6 @@ test-unit = [
   { include-group = "test-base" },
   "attrs",
   "coverage",
-  "eval-type-backport; python_version < '3.10'",
   "msgpack",
   "pyyaml",
   "tomli; python_version < '3.11'",

pyproject.toml

@@ -17,7 +17,6 @@
 #include "atof.h"
 
 /* Python version checks */
-#define PY310_PLUS (PY_VERSION_HEX >= 0x030a0000)
 #define PY311_PLUS (PY_VERSION_HEX >= 0x030b0000)
 #define PY312_PLUS (PY_VERSION_HEX >= 0x030c0000)
 #define PY313_PLUS (PY_VERSION_HEX >= 0x030d0000)
@@ -511,9 +510,7 @@ typedef struct {
     PyObject *get_typeddict_info;
     PyObject *get_dataclass_info;
     PyObject *rebuild;
-#if PY310_PLUS
     PyObject *types_uniontype;
-#endif
 #if PY312_PLUS
     PyObject *typing_typealiastype;
 #endif
@@ -4899,15 +4896,13 @@ typenode_origin_args_metadata(
         }
     }
 
-    #if PY310_PLUS
     if (Py_TYPE(t) == (PyTypeObject *)(state->mod->types_uniontype)) {
         /* Handle types.UnionType unions (`int | float | ...`) */
         args = PyObject_GetAttr(t, state->mod->str___args__);
         if (args == NULL) goto error;
         origin = state->mod->typing_union;
         Py_INCREF(origin);
     }
-    #endif
 
     *out_origin = origin;
     *out_args = args;
@@ -10500,15 +10495,8 @@ ms_encode_err_type_unsupported(PyTypeObject *type) {
  *************************************************************************/
 
 #define MS_HAS_TZINFO(o)  (((_PyDateTime_BaseTZInfo *)(o))->hastzinfo)
-#if PY310_PLUS
 #define MS_DATE_GET_TZINFO(o) PyDateTime_DATE_GET_TZINFO(o)
 #define MS_TIME_GET_TZINFO(o) PyDateTime_TIME_GET_TZINFO(o)
-#else
-#define MS_DATE_GET_TZINFO(o)      (MS_HAS_TZINFO(o) ? \
-    ((PyDateTime_DateTime *)(o))->tzinfo : Py_None)
-#define MS_TIME_GET_TZINFO(o)      (MS_HAS_TZINFO(o) ? \
-    ((PyDateTime_Time *)(o))->tzinfo : Py_None)
-#endif
 
 #ifndef Py_GIL_DISABLED
 #ifndef TIMEZONE_CACHE_SIZE
@@ -22298,9 +22286,7 @@ msgspec_clear(PyObject *m)
     Py_CLEAR(st->get_typeddict_info);
     Py_CLEAR(st->get_dataclass_info);
     Py_CLEAR(st->rebuild);
-#if PY310_PLUS
     Py_CLEAR(st->types_uniontype);
-#endif
 #if PY312_PLUS
     Py_CLEAR(st->typing_typealiastype);
 #endif
@@ -22372,9 +22358,7 @@ msgspec_traverse(PyObject *m, visitproc visit, void *arg)
     Py_VISIT(st->get_typeddict_info);
     Py_VISIT(st->get_dataclass_info);
     Py_VISIT(st->rebuild);
-#if PY310_PLUS
     Py_VISIT(st->types_uniontype);
-#endif
 #if PY312_PLUS
     Py_VISIT(st->typing_typealiastype);
 #endif
@@ -22594,12 +22578,10 @@ PyInit__core(void)
     SET_REF(rebuild, "rebuild");
     Py_DECREF(temp_module);
 
-#if PY310_PLUS
     temp_module = PyImport_ImportModule("types");
     if (temp_module == NULL) return NULL;
     SET_REF(types_uniontype, "UnionType");
     Py_DECREF(temp_module);
-#endif
 
     /* Get the EnumMeta type */
     temp_module = PyImport_ImportModule("enum");

src/msgspec/_core.c

@@ -44,28 +44,7 @@ def _forward_ref(value):
 
     def _eval_type(t, globalns, localns):
         return typing._eval_type(t, globalns, localns, ())
-elif sys.version_info < (3, 10):
 
-    def _eval_type(t, globalns, localns):
-        try:
-            return typing._eval_type(t, globalns, localns)
-        except TypeError as e:
-            try:
-                from eval_type_backport import eval_type_backport
-            except ImportError:
-                raise TypeError(
-                    f"Unable to evaluate type annotation {t.__forward_arg__!r}. If you are making use "
-                    "of the new typing syntax (unions using `|` since Python 3.10 or builtins subscripting "
-                    "since Python 3.9), you should either replace the use of new syntax with the existing "
-                    "`typing` constructs or install the `eval_type_backport` package."
-                ) from e
-
-            return eval_type_backport(
-                t,
-                globalns,
-                localns,
-                try_default=False,
-            )
 else:
     _eval_type = typing._eval_type