PYTHON-6063 Remove PyPy support

.evergreen/generated_configs/variants.yml

@@ -196,8 +196,8 @@ buildvariants:
     tags: [encryption_tag]
   - name: encryption-macos
     tasks:
-      - name: .test-non-standard !.pypy !.cov !.python-3.15t
-      - name: .test-non-standard-no-cov !.pypy !.python-3.15t
+      - name: .test-non-standard !.cov !.python-3.15t
+      - name: .test-non-standard-no-cov !.python-3.15t
       - name: .test-string-query-preview
     display_name: Encryption macOS
     run_on:
@@ -208,8 +208,8 @@ buildvariants:
     tags: [encryption_tag]
   - name: encryption-win64
     tasks:
-      - name: .test-non-standard !.pypy !.cov !.python-3.15t
-      - name: .test-non-standard-no-cov !.pypy !.python-3.15t
+      - name: .test-non-standard !.cov !.python-3.15t
+      - name: .test-non-standard-no-cov !.python-3.15t
       - name: .test-string-query-preview
     display_name: Encryption Win64
     run_on:
@@ -232,8 +232,8 @@ buildvariants:
     tags: [encryption_tag]
   - name: encryption-crypt_shared-macos
     tasks:
-      - name: .test-non-standard !.pypy !.cov !.python-3.15t
-      - name: .test-non-standard-no-cov !.pypy !.python-3.15t
+      - name: .test-non-standard !.cov !.python-3.15t
+      - name: .test-non-standard-no-cov !.python-3.15t
       - name: .test-string-query-preview
     display_name: Encryption crypt_shared macOS
     run_on:
@@ -245,8 +245,8 @@ buildvariants:
     tags: [encryption_tag]
   - name: encryption-crypt_shared-win64
     tasks:
-      - name: .test-non-standard !.pypy !.cov !.python-3.15t
-      - name: .test-non-standard-no-cov !.pypy !.python-3.15t
+      - name: .test-non-standard !.cov !.python-3.15t
+      - name: .test-non-standard-no-cov !.python-3.15t
       - name: .test-string-query-preview
     display_name: Encryption crypt_shared Win64
     run_on:
@@ -301,7 +301,7 @@ buildvariants:
       AUTH: auth
   - name: auth-enterprise-macos
     tasks:
-      - name: .test-standard-auth !.pypy .auth !.free-threaded
+      - name: .test-standard-auth .auth !.free-threaded
     display_name: Auth Enterprise macOS
     run_on:
       - macos-14
@@ -310,7 +310,7 @@ buildvariants:
       AUTH: auth
   - name: auth-enterprise-win64
     tasks:
-      - name: .test-standard-auth !.pypy .auth !.free-threaded
+      - name: .test-standard-auth .auth !.free-threaded
     display_name: Auth Enterprise Win64
     run_on:
       - windows-2022-latest-small
@@ -490,8 +490,8 @@ buildvariants:
       SUB_TEST_NAME: pyopenssl
   - name: pyopenssl-macos
     tasks:
-      - name: .test-standard !.pypy !.python-3.15t .sync
-      - name: .test-standard !.pypy !.python-3.15t .async .replica_set-noauth-ssl
+      - name: .test-standard !.python-3.15t .sync
+      - name: .test-standard !.python-3.15t .async .replica_set-noauth-ssl
     display_name: PyOpenSSL macOS
     run_on:
       - macos-14
@@ -500,8 +500,8 @@ buildvariants:
       SUB_TEST_NAME: pyopenssl
   - name: pyopenssl-win64
     tasks:
-      - name: .test-standard !.pypy !.python-3.15t .sync
-      - name: .test-standard !.pypy !.python-3.15t .async .replica_set-noauth-ssl
+      - name: .test-standard !.python-3.15t .sync
+      - name: .test-standard !.python-3.15t .async .replica_set-noauth-ssl
     display_name: PyOpenSSL Win64
     run_on:
       - windows-2022-latest-small
@@ -651,34 +651,34 @@ buildvariants:
   # Standard nonlinux tests
   - name: test-macos
     tasks:
-      - name: .test-standard !.pypy
+      - name: .test-standard
     display_name: "* Test macOS"
     run_on:
       - macos-14
     tags: [standard-non-linux]
   - name: test-macos-arm64
     tasks:
-      - name: .test-standard !.pypy .server-6.0
-      - name: .test-standard !.pypy .server-7.0
-      - name: .test-standard !.pypy .server-8.0
-      - name: .test-standard !.pypy .server-9.0
-      - name: .test-standard !.pypy .server-rapid
-      - name: .test-standard !.pypy .server-latest
+      - name: .test-standard .server-6.0
+      - name: .test-standard .server-7.0
+      - name: .test-standard .server-8.0
+      - name: .test-standard .server-9.0
+      - name: .test-standard .server-rapid
+      - name: .test-standard .server-latest
     display_name: "* Test macOS Arm64"
     run_on:
       - macos-14-arm64
     tags: [standard-non-linux]
   - name: test-win64
     tasks:
-      - name: .test-standard !.pypy
-      - name: .test-no-orchestration !.pypy
+      - name: .test-standard
+      - name: .test-no-orchestration
     display_name: "* Test Win64"
     run_on:
       - windows-2022-latest-small
     tags: [standard-non-linux]
   - name: test-win32
     tasks:
-      - name: .test-standard !.pypy !.free-threaded
+      - name: .test-standard !.free-threaded
     display_name: "* Test Win32"
     run_on:
       - windows-64-vsMulti-small

.evergreen/scripts/generate_config.py

@@ -15,7 +15,6 @@
     HOSTS,
     MIN_MAX_PYTHON,
     OTHER_HOSTS,
-    PYPYS,
     SYNCS,
     TOPOLOGIES,
     create_variant,
@@ -104,20 +103,18 @@ def create_standard_nonlinux_variants() -> list[BuildVariant]:
 
     # Test a subset on each of the other platforms.
     for host_name in ("macos", "macos-arm64", "win64", "win32"):
-        tasks = [".test-standard !.pypy"]
+        tasks = [".test-standard"]
         # MacOS arm64 only works on server versions 6.0+
         if host_name == "macos-arm64":
-            tasks = [
-                f".test-standard !.pypy .server-{version}" for version in get_versions_from("6.0")
-            ]
+            tasks = [f".test-standard .server-{version}" for version in get_versions_from("6.0")]
         if host_name == "win64":
-            tasks.append(".test-no-orchestration !.pypy")
+            tasks.append(".test-no-orchestration")
         host = HOSTS[host_name]
         tags = ["standard-non-linux"]
         expansions = dict()
         if host_name == "win32":
             expansions["IS_WIN32"] = "1"
-            tasks = [".test-standard !.pypy !.free-threaded"]
+            tasks = [".test-standard !.free-threaded"]
         display_name = get_variant_name(base_display_name, host)
         variant = create_variant(tasks, display_name, host=host, tags=tags, expansions=expansions)
         variants.append(variant)
@@ -146,13 +143,13 @@ def get_encryption_expansions(encryption):
         display_name = get_variant_name(encryption, host, **expansions)
         tasks = [".test-non-standard !.python-3.15t", ".test-string-query-preview"]
         if host != "rhel8":
-            # Exclude PyPy (not tested with encryption on macOS/win64) and coverage tasks
-            # (encryption suites exceed the 60-min timeout with coverage overhead on macOS/win64).
+            # Exclude coverage tasks (encryption suites exceed the 60-min timeout with
+            # coverage overhead on macOS/win64).
             # Also include the non-coverage companion tasks (test-non-standard-no-cov) which
             # carry the "latest" server tasks without COVERAGE=1.
             tasks = [
-                ".test-non-standard !.pypy !.cov !.python-3.15t",
-                ".test-non-standard-no-cov !.pypy !.python-3.15t",
+                ".test-non-standard !.cov !.python-3.15t",
+                ".test-non-standard-no-cov !.python-3.15t",
                 ".test-string-query-preview",
             ]
         variant = create_variant(
@@ -275,10 +272,10 @@ def create_enterprise_auth_variants():
         tasks = [".test-standard-auth .auth !.free-threaded"]
         # https://jira.mongodb.org/browse/PYTHON-5586
         if host == "macos":
-            tasks = [".test-standard-auth !.pypy .auth !.free-threaded"]
+            tasks = [".test-standard-auth .auth !.free-threaded"]
         if host == "win64":
             # https://jira.mongodb.org/browse/PYTHON-5704
-            tasks = [".test-standard-auth !.pypy .auth !.free-threaded"]
+            tasks = [".test-standard-auth .auth !.free-threaded"]
         variant = create_variant(tasks, display_name, host=host, expansions=expansions)
         variants.append(variant)
     return variants
@@ -292,11 +289,7 @@ def create_pyopenssl_variants():
 
     for host in ["rhel8", "macos", "win64"]:
         display_name = get_variant_name(base_name, host)
-        base_task = (
-            ".test-standard !.python-3.15t"
-            if host == "rhel8"
-            else ".test-standard !.pypy !.python-3.15t"
-        )
+        base_task = ".test-standard !.python-3.15t"
         # We only need to run a subset on async.
         tasks = [f"{base_task} .sync", f"{base_task} .async .replica_set-noauth-ssl"]
         variants.append(
@@ -728,9 +721,6 @@ def create_test_non_standard_tasks():
     for (version, topology), python in zip_cycle(list(product(ALL_VERSIONS, TOPOLOGIES)), CPYTHONS):
         pr = version == "latest" and topology == "sharded_cluster"
         task_combos.add((version, topology, python, pr))
-    # For each PyPy and topology, rotate through the MongoDB versions.
-    for (python, topology), version in zip_cycle(list(product(PYPYS, TOPOLOGIES)), ALL_VERSIONS):
-        task_combos.add((version, topology, python, False))
     for version, topology, python, pr in sorted(task_combos):
         auth, ssl = get_standard_auth_ssl(topology)
         tags = [
@@ -742,8 +732,6 @@ def create_test_non_standard_tasks():
         ]
         if "t" in python:
             tags.append("free-threaded")
-        if python in PYPYS:
-            tags.append("pypy")
         if pr:
             tags.append("pr")
         expansions = dict(AUTH=auth, SSL=ssl, TOPOLOGY=topology, VERSION=version)
@@ -819,11 +807,6 @@ def create_test_standard_auth_tasks():
     ):
         pr = version == "latest"
         task_combos.add((version, topology, python, pr))
-    # Rotate through each PyPy and MongoDB versions.
-    for (python, topology), version in zip_cycle(
-        list(product(PYPYS, ["sharded_cluster"])), ALL_VERSIONS
-    ):
-        task_combos.add((version, topology, python, False))
     for version, topology, python, pr in sorted(task_combos):
         auth, ssl = get_standard_auth_ssl(topology)
         tags = [
@@ -835,8 +818,6 @@ def create_test_standard_auth_tasks():
         ]
         if "t" in python:
             tags.append("free-threaded")
-        if python in PYPYS:
-            tags.append("pypy")
         if pr:
             tags.append("pr")
         expansions = dict(AUTH=auth, SSL=ssl, TOPOLOGY=topology, VERSION=version)
@@ -859,9 +840,9 @@ def create_standard_tasks():
     task_combos = set()
     # For each python and topology and sync/async, rotate through the the versions.
     for (python, topology, sync), version in zip_cycle(
-        list(product(CPYTHONS + PYPYS, TOPOLOGIES, SYNCS)), ALL_VERSIONS
+        list(product(CPYTHONS, TOPOLOGIES, SYNCS)), ALL_VERSIONS
     ):
-        pr = version == "latest" and python not in PYPYS
+        pr = version == "latest"
         task_combos.add((version, topology, python, sync, pr))
 
     for version, topology, python, sync, pr in sorted(task_combos):
@@ -875,8 +856,6 @@ def create_standard_tasks():
         ]
         if "t" in python:
             tags.append("free-threaded")
-        if python in PYPYS:
-            tags.append("pypy")
         if pr:
             tags.append("pr")
         expansions = dict(AUTH=auth, SSL=ssl, TOPOLOGY=topology, VERSION=version)
@@ -896,7 +875,7 @@ def create_standard_tasks():
 
 def create_no_orchestration_tasks():
     tasks = []
-    for python in [*MIN_MAX_PYTHON, PYPYS[-1]]:
+    for python in MIN_MAX_PYTHON:
         tags = [
             "test-no-orchestration",
             f"python-{python}",

.evergreen/scripts/generate_config_utils.py

@@ -23,9 +23,8 @@
 
 ALL_VERSIONS = ["4.4", "5.0", "6.0", "7.0", "8.0", "9.0", "rapid", "latest"]
 CPYTHONS = ["3.11", "3.12", "3.13", "3.14t", "3.14", "3.15t", "3.15"]
-PYPYS = ["pypy3.11"]
 MIN_SUPPORT_VERSIONS = ["3.11"]
-ALL_PYTHONS = CPYTHONS + PYPYS
+ALL_PYTHONS = CPYTHONS
 MIN_MAX_PYTHON = [CPYTHONS[0], CPYTHONS[-1]]
 BATCHTIME_WEEK = 10080
 BATCHTIME_DAY = 1440
@@ -179,10 +178,7 @@ def get_common_name(base: str, sep: str, **kwargs) -> str:
     for key, value in kwargs.items():
         name = value
         if key.lower() in ["python", "uv_python"]:
-            if not value.startswith("pypy"):
-                name = f"Python{value}"
-            else:
-                name = f"PyPy{value.replace('pypy', '')}"
+            name = f"Python{value}"
         elif key.lower() in DISPLAY_LOOKUP and value in DISPLAY_LOOKUP[key.lower()]:
             name = DISPLAY_LOOKUP[key.lower()][value]
         else:

.evergreen/scripts/setup-uv-python.sh

@@ -2,8 +2,8 @@
 # Choose the Python that uv uses, and make sure uv can provide it.
 #
 # Input:
-#   UV_PYTHON - a version ("3.11", "3.14t"), an implementation ("pypy3.11"),
-#               or an interpreter path ("/usr/bin/python3.11").
+#   UV_PYTHON - a version ("3.11", "3.14t") or an interpreter path
+#               ("/usr/bin/python3.11").
 #
 # Exports:
 #   UV_PYTHON_SEARCH_PATH - the Python toolchain bin dir for the request, so uv

.evergreen/scripts/setup_tests.py

@@ -528,8 +528,7 @@ def handle_test_env() -> None:
             TEST_ARGS = f"test/performance/async_perf_test.py {TEST_ARGS}"
 
     # Add coverage if requested.
-    # Only cover CPython. PyPy reports suspiciously low coverage.
-    if opts.cov and platform.python_implementation() == "CPython":
+    if opts.cov:
         # Keep in sync with combine-coverage.sh.
         # coverage >=5 is needed for relative_files=true.
         UV_ARGS.append("--group coverage")

CONTRIBUTING.md

@@ -16,8 +16,7 @@ be of interest or that has already been addressed.
 
 ## Supported Interpreters
 
-PyMongo supports CPython 3.11+ and PyPy 3.11+. Language features not
-supported by all interpreters can not be used.
+PyMongo supports CPython 3.11+.
 
 ## Style Guide
 
@@ -464,10 +463,10 @@ To run any of the test suites with minimum supported dependencies, pass `--test-
 - If there are any services or atlas clusters to teardown, handle them in `.evergreen/scripts/teardown_tests.py`.
 - Add functions to generate the test variant(s) and task(s) to the `.evergreen/scripts/generate_config.py`.
 - There are some considerations about the Python version used in the test:
-    - To request a specific Python, set `UV_PYTHON` (e.g. `UV_PYTHON=3.10`, `UV_PYTHON=3.14t`, or
-`UV_PYTHON=pypy3.11`).  Tasks are host-agnostic, so the interpreter lookup happens on the host: for a plain
+    - To request a specific Python, set `UV_PYTHON` (e.g. `UV_PYTHON=3.10` or `UV_PYTHON=3.14t`).
+Tasks are host-agnostic, so the interpreter lookup happens on the host: for a plain
 CPython version whose toolchain dir exists, `UV_PYTHON_SEARCH_PATH` points uv at it, and for anything else
-(including PyPy, or a version the toolchain lacks) uv downloads it.
+(a version the toolchain lacks) uv downloads it.
     - If a specific Python binary is needed (for example on the FIPS host), set `UV_PYTHON=/path/to/python`.
     - The default if `UV_PYTHON` is not set is CPython 3.10.  This is deterministic across host types, so a task
       that does not pin a version always gets the same Python (with the build headers (`Python.h`) needed to build

README.md

@@ -98,7 +98,7 @@ package that is incompatible with PyMongo.
 
 ## Dependencies
 
-PyMongo supports CPython 3.11+ and PyPy3.11+. PyPy support is deprecated and will be removed in a future release.
+PyMongo supports CPython 3.11+.
 
 Required dependencies:
 

_setup.py

@@ -130,11 +130,7 @@ def build_extension(self, ext):
     except ValueError:
         pass
     ext_modules = []
-elif (
-    sys.platform.startswith("java")
-    or sys.platform == "cli"
-    or sys.implementation.name in ("pypy", "graalpy")
-):
+elif sys.implementation.name == "graalpy":
     sys.stdout.write(
         """
 *****************************************************\n

bson/codec_options.py

@@ -382,10 +382,9 @@ def __new__(
         ) -> CodecOptions:
             doc_class = document_class or dict
             # Generic aliases like SON[str, Any] or dict[str, Any] aren't classes, so
-            # resolve to their origin before the subclass check. Whether issubclass()
-            # raises TypeError or just returns False for such aliases is inconsistent
-            # across Python implementations (e.g. PyPy vs CPython), so check the
-            # origin proactively instead of relying on catching the error.
+            # resolve to their origin before the subclass check. issubclass() raises
+            # TypeError for such aliases, so check the origin proactively instead of
+            # relying on catching the error.
             check_class = getattr(doc_class, "__origin__", doc_class)
             try:
                 is_mapping = issubclass(check_class, _MutableMapping)

doc/changelog.rst

@@ -6,11 +6,12 @@ Changes in Version 4.19.0 (2026/XX/XX)
 
 PyMongo 4.19 brings a number of changes including:
 
-.. warning:: PyMongo 4.19 drops support for Python 3.9 and 3.10 and PyPy 3.9
-  and 3.10: Python 3.11+ or PyPy 3.11+ is now required.
+.. warning:: PyMongo 4.19 drops support for Python 3.9 and 3.10 and removes
+  PyPy support: Python 3.11+ is now required.
 
 - Added support for Python 3.15.
-- Dropped support for Python 3.9 and 3.10 and PyPy 3.9 and 3.10 (PYTHON-6138).
+- Dropped support for Python 3.9 and 3.10.
+- Removed support for PyPy.
 - Added support for running the synchronous and asynchronous clients in
   subinterpreters, including inside
   ``concurrent.futures.InterpreterPoolExecutor`` (Python 3.14+). Only in