PYTHON-5479 Drop support for Python 3.9

Author: blink1073

.evergreen/generated_configs/tasks.yml

@@ -22,7 +22,7 @@
 ##############
 
 ALL_VERSIONS = ["4.2", "4.4", "5.0", "6.0", "7.0", "8.0", "rapid", "latest"]
-CPYTHONS = ["3.10", "3.9", "3.11", "3.12", "3.13", "3.14"]
+CPYTHONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
 PYPYS = ["pypy3.10"]
 ALL_PYTHONS = CPYTHONS + PYPYS
 MIN_MAX_PYTHON = [CPYTHONS[0], CPYTHONS[-1]]

.evergreen/scripts/generate_config_utils.py

@@ -6,29 +6,29 @@ find_python3() {
     PYTHON=""
     # Find a suitable toolchain version, if available.
     if [ "$(uname -s)" = "Darwin" ]; then
-        PYTHON="/Library/Frameworks/Python.Framework/Versions/3.9/bin/python3"
+        PYTHON="/Library/Frameworks/Python.Framework/Versions/3.10/bin/python3"
     elif [ "Windows_NT" = "${OS:-}" ]; then # Magic variable in cygwin
-        PYTHON="C:/python/Python39/python.exe"
+        PYTHON="C:/python/Python310/python.exe"
     else
-        # Prefer our own toolchain, fall back to mongodb toolchain if it has Python 3.9+.
-        if [ -f "/opt/python/3.9/bin/python3" ]; then
+        # Prefer our own toolchain, fall back to mongodb toolchain if it has Python 3.10+.
+        if [ -f "/opt/python/3.10/bin/python3" ]; then
             PYTHON="/opt/python/Current/bin/python3"
-        elif is_python_39 "$(command -v /opt/mongodbtoolchain/v5/bin/python3)"; then
+        elif is_python_310 "$(command -v /opt/mongodbtoolchain/v5/bin/python3)"; then
             PYTHON="/opt/mongodbtoolchain/v5/bin/python3"
-        elif is_python_39 "$(command -v /opt/mongodbtoolchain/v4/bin/python3)"; then
+        elif is_python_310 "$(command -v /opt/mongodbtoolchain/v4/bin/python3)"; then
             PYTHON="/opt/mongodbtoolchain/v4/bin/python3"
-        elif is_python_39 "$(command -v /opt/mongodbtoolchain/v3/bin/python3)"; then
+        elif is_python_310 "$(command -v /opt/mongodbtoolchain/v3/bin/python3)"; then
             PYTHON="/opt/mongodbtoolchain/v3/bin/python3"
         fi
     fi
-    # Add a fallback system python3 if it is available and Python 3.9+.
+    # Add a fallback system python3 if it is available and Python 3.10+.
     if [ -z "$PYTHON" ]; then
-        if is_python_39 "$(command -v python3)"; then
+        if is_python_310 "$(command -v python3)"; then
             PYTHON="$(command -v python3)"
         fi
     fi
     if [ -z "$PYTHON" ]; then
-        echo "Cannot test without python3.9+ installed!"
+        echo "Cannot test without python3.10+ installed!"
         exit 1
     fi
     echo "$PYTHON"
@@ -99,15 +99,15 @@ testinstall () {
     fi
 }
 
-# Function that returns success if the provided Python binary is version 3.9 or later
+# Function that returns success if the provided Python binary is version 3.10 or later
 # Usage:
-# is_python_39 /path/to/python
+# is_python_310 /path/to/python
 # * param1: Python binary
-is_python_39() {
+is_python_310() {
     if [ -z "$1" ]; then
         return 1
-    elif $1 -c "import sys; exit(sys.version_info[:2] < (3, 9))"; then
-        # runs when sys.version_info[:2] >= (3, 9)
+    elif $1 -c "import sys; exit(sys.version_info[:2] < (3, 10))"; then
+        # runs when sys.version_info[:2] >= (3, 10)
         return 0
     else
         return 1
@@ -131,7 +131,7 @@ get_python_binary() {
     else
         PYTHON="/opt/python/$version/bin/python3"
     fi
-    if is_python_39 "$(command -v $PYTHON)"; then
+    if is_python_310 "$(command -v $PYTHON)"; then
         echo "$PYTHON"
     else
         echo "Could not find suitable python binary for '$version'"  >&2

.evergreen/utils.sh

@@ -16,7 +16,7 @@ be of interest or that has already been addressed.
 
 ## Supported Interpreters
 
-PyMongo supports CPython 3.9+ and PyPy3.10+. Language features not
+PyMongo supports CPython 3.10+ and PyPy3.10+. Language features not
 supported by all interpreters can not be used.
 
 ## Style Guide

CONTRIBUTING.md

@@ -97,7 +97,7 @@ package that is incompatible with PyMongo.
 
 ## Dependencies
 
-PyMongo supports CPython 3.9+ and PyPy3.10+.
+PyMongo supports CPython 3.10+ and PyPy3.10+.
 
 Required dependencies:
 

README.md

@@ -6,6 +6,9 @@ Changes in Version 4.16.0 (XXXX/XX/XX)
 
 PyMongo 4.16 brings a number of changes including:
 
+.. warning:: PyMongo 4.16 drops support for Python 3.9: Python 3.10+is now required.
+
+- Dropped support for Python 3.9.
 - Removed invalid documents from :class:`bson.errors.InvalidDocument` error messages as
   doing so may leak sensitive user data.
   Instead, invalid documents are stored in :attr:`bson.errors.InvalidDocument.document`.

doc/changelog.rst

@@ -37,7 +37,6 @@
 from bson.code import Code
 from bson.son import SON
 from pymongo import _csot, helpers_shared
-from pymongo.asynchronous.helpers import anext
 from pymongo.collation import validate_collation_or_none
 from pymongo.common import (
     validate_is_document_type,

pymongo/asynchronous/cursor.py

@@ -16,9 +16,7 @@
 from __future__ import annotations
 
 import asyncio
-import builtins
 import socket
-import sys
 from typing import (
     Any,
     Callable,
@@ -86,17 +84,3 @@ async def _getaddrinfo(
         return await loop.getaddrinfo(host, port, **kwargs)  # type: ignore[return-value]
     else:
         return socket.getaddrinfo(host, port, **kwargs)
-
-
-if sys.version_info >= (3, 10):
-    anext = builtins.anext
-    aiter = builtins.aiter
-else:
-
-    async def anext(cls: Any) -> Any:
-        """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#anext."""
-        return await cls.__anext__()
-
-    def aiter(cls: Any) -> Any:
-        """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#anext."""
-        return cls.__aiter__()

pymongo/asynchronous/helpers.py

@@ -55,7 +55,6 @@
     _RawBatchQuery,
 )
 from pymongo.response import PinnedResponse
-from pymongo.synchronous.helpers import next
 from pymongo.typings import _Address, _CollationIn, _DocumentOut, _DocumentType
 from pymongo.write_concern import validate_boolean
 

pymongo/synchronous/cursor.py

@@ -16,9 +16,7 @@
 from __future__ import annotations
 
 import asyncio
-import builtins
 import socket
-import sys
 from typing import (
     Any,
     Callable,
@@ -86,17 +84,3 @@ def _getaddrinfo(
         return loop.getaddrinfo(host, port, **kwargs)  # type: ignore[return-value]
     else:
         return socket.getaddrinfo(host, port, **kwargs)
-
-
-if sys.version_info >= (3, 10):
-    next = builtins.next
-    iter = builtins.iter
-else:
-
-    def next(cls: Any) -> Any:
-        """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#next."""
-        return cls.__next__()
-
-    def iter(cls: Any) -> Any:
-        """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#next."""
-        return cls.__iter__()