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Upcoming

  • Mark top-level mangled identifiers as TypeAlias.
  • Change the top-level mangling prefix from global___ to Global___ to respect Y042 naming convention.

3.6.0

  • Remove 3.7 compatibility for typing_extensions.final/Literal
  • Bump protobuf to 4.25.3

3.5.0

  • Add gRPC aio stub and servicer generation (#489)
  • Bump tested dependencies to pyright==1.1.319, mypy==1.4.1, protobuf==4.23.4, grpcio-tools==1.56.2
  • Drop support for py 3.7. Add support for py 3.11.
  • Don't add unnecessary flake8 noqa F821 comments. (Become compatible with flake8-pyi>=23.5.0.)

3.4.0

3.3.0

  • Prefer (mypy_protobuf.options).casttype to (mypy_protobuf.casttype)
    • Allows us to use a single extension number
    • Applies to casttype,keytype,valuetype
    • Deprecate (but still support) the old-style extension
  • Prefer importing from typing over typing_extensions on new enough python versions
  • Support emitting module docstrings
  • Make generated code flake8 compatible
  • Convert extensions.proto to proto3
  • Drop support for Python 3.6 [EOL]
  • Bump to grpc-stubs 1.24.7
  • Require protobuf 3.19.4
  • Bump support to mypy 0.941
  • Use PEP 604 Union syntax X | None rather than Optional[X]
  • Moved from dropbox/mypy-protobuf to nipunn1313/mypy-protobuf
    • Nipunn is the primary maintainer and plans to continue maintenance!

3.2.0

  • Remove unnecessary ... in generated files.
  • Reorder/reference enum classes to avoid forward references.
  • Support *_FIELD_NUMBER for extensions
  • Bump types-protobuf dependency to 3.19
  • Require protobuf 3.19.3
  • Support DESCRIPTOR: ServiceDescriptor in py generic services
  • More accurately represent method names in py generic services (done -> callback, self -> inst)
  • More accurately represent method names in grpc services (request -> request_iterator)
  • Internal: Get tests to pass on pure-python protobuf impl (minor semantic differences)
  • Internal: Bump pyright in testing to 1.1.206
  • Internal: Use stubtest to validate generated stubs match generated runtime

3.1.0

  • Require protobuf 3.19.1
  • Change EnumTypeWrapper.V to EnumTypeWrapper.ValueType per protocolbuffers/protobuf#8182. Will allow for unquoted annotations starting with protobuf 3.20.0. .V will continue to work for the foreseeable future for backward compatibility.
  • suppress pyright warning reportSelfClsParameterName when a proto field is named self
  • Allow optional constructor keywords for primitive field types in proto3, following this chart.
  • Reorder Enum helper classes to eliminate pycharm errors

3.0.0

  • Drop support for targeting python 2.7
  • Generate py3 specific syntax for unicode strings ("" rather than u"")
  • Now requires protobuf 3.18.0
  • Handle escaping properly in docstrings and attribute strings (#296)
  • Use three-digit version number 3.0.0 for minor and patch releases
  • Codify pyright support in README

2.10

  • Switch from setup.py to pyproject.toml and setup.cfg per https://packaging.python.org/tutorials/packaging-projects/
  • Remove dependency on grpcio-tools. mypy-protobuf doesn't need it to run. It's only needed to run mypy afterward.
  • Avoid relative imports in _grpc_pb2.pyi stubs. grpc stubs themselves don't use relative imports, nor __init__.py files
  • Use """ docstring style comments in generated code rather than # style so it shows up in IDEs.
  • Disambiguate messages from reserved python keywords (eg None) with prefix _r_ rather than __ - since __ is considered private.
  • Bump tests to use pyright 1.1.169, types-protobuf 3.17.4, pytest 6.2.5, grpc-stubs 1.24.7, grpcio-tools 1.40.0
  • Since upstream protobuf has dropped support with 3.18.0, 2.10 will be the last mypy-protobuf that supports targeting python 2.7. Updated docs for this.

2.9

2.8

  • Propagate comments from .proto files to .pyi files
  • Add protobuf type stubs to the setup requirements
  • Fix #239 Remove type: ignore used in enum by pulling V into a separate class.
  • Use pytest 6.2.4 for internal test suites on python3
  • Remove protoc_gen_mypy.bat as the entry-points method creates protoc-gen-mypy.exe. Add test confirming.

2.7

  • Fix #244 - support extensions defined at module scope with proper types, matching extensions defined within Messages. See _ExtensionDict
extend google.protobuf.MessageOptions {
   string test_message_option = 51234;
}
# Used to generate
test_message_option: google.protobuf.descriptor.FieldDescriptor = ...

# Now generates
test_message_option: google.protobuf.internal.extension_dict._ExtensionFieldDescriptor[google.protobuf.descriptor_pb2.MessageOptions, typing.Text] = ...

Fix repeated extensions as well - to generate RepeatedScalarFieldContainer and RepeatedCompositeFieldContainer

  • Now requires types-protobuf 3.17.3
  • Fix #238 - handling enum variants that name conflict with EnumTypeWrapper methods
  • Improve mypy-protobuf testsuite expected-errors file to make insertions/deletions easier to code review
  • Fix #227 - improve support for messages/enums with python reserved keyword names
  • Order fields within a message in original .proto file order Previously, they were grouped by scalar/nonscalar. Remove that grouping to make it a bit easier to correlate .proto files to .pyi files.

2.6

  • Bump protoc support to 3.17.3
  • Use latest python versions in tests (3.6.14 3.7.11 3.8.11 3.9.6)
  • Support reserved names for message types. Previously generated invalid mypy.
message M {
  message None {}
  None none = 1;
}
  • Support protoc-gen-mypy -V and protoc-gen-mypy --version to print version number
  • Return Optional[Literal[...]] instead of Literal[...] from WhichOneof to support cases in which none of the fields of the WhichOneof are set. See the following example.
def hello(name: str) -> None: ...
n = proto.WhichOneof("name")
hello(n)  # Will now result in a mypy error.
assert n is not None
hello(n)  # Should work ok

2.5

  • Organized generated enum code to prevent definition ordering issues in Pyright-based linters
  • Changed type generation for grpcio stubs to use the MultiCallable API (see here) . This requires using the grpc-stubs typings for grpcio. This change should allow calling stub methods with common parameters (timeout, metadata, etc.) as well as calling methods on the MultiCallable object (e.g. my_stub.MyRpcMethod.future()).
  • Update stubs to mark repeated scalar and repeated enum fields as read-only

2.4

  • Add support for _FIELD_NUMBER generated fields on messages as specified in the spec

2.3

  • Fix CI caching across version updates.
  • Added unit testing for EnumTypeWrapper.Value usage
  • Reexport of top level enum values when using import public

2.2

  • Fix bug where module level DESCRIPTOR: FileDescriptor was not being generated for files w public imports

2.1

  • Fix crash when a import public reexport when dependent proto file is not listed on command line for generation

2.0

Non Backward Compatible Changes

  • Dropping support for running mypy-protobuf in python <= 3.5. Note you can still generate stubs target-compatible to python2
  • Type proto Enum values for as MyEnum.V rather than MyEnumValue for import ergonomics, allowing the caller to import MyEnum rather than conditionally importing MyEnumValue
  • Default disallow None as argument for primitive fields of constructors in proto3. Provided relax_strict_optional_primitives flag to relax this strictness if you prefer.

New Features

  • Support for grpcio stubs generation
  • Allow mypy_protobuf.py to be run directly as a script
  • Add support for proto's well_known_types
  • Support message fields named self - by renaming the constructor's self to self_
  • Rename extensions proto from mypy/mypy.proto to mypy_protobuf/extensions.proto
  • Add support for mypy-proto extensions mypy_protobuf.casttype, mypy_protobuf.keytype, and mypy_protobuf.valuetype
  • Add support for import public proto imports - by reexporting in generated code

Output Format

  • Generate fully qualified references rather than mangling
  • Import builtins library rather than mangling builtins
  • Use fully qualified names rather than mangling imports
  • Only mangle-alias top-level identifiers w/ global___ to avoid conflict w/ fields of same name [previously was mangling inner messages as well]
  • Add support for readable_stubs parameter for mangle-free output code w/o fully-qualified references to message. (in many cases this is good enough and easier to read)
  • Generate arg: Optional[type] = ... instead of arg: Optional[type] = None
  • Avoid importing google.protobuf.message.Message unless it's needed

Internal Improvements

  • Add support for python 3.9 to CI
  • Update mypy-protobuf CI to target 3.8 rather than 3.5
  • Inline mypy annotations, eliminate six, and remove __future__ import in mypy_protobuf_lib.py
  • Flatten directory structure (remove python subdirectory). Updated unreleased installation instructions.
  • Deprecate and delete the go/ implementation

1.24

  • Bump required mypy version to 0.800
  • Bump required protobuf version to 3.14 (pi!!)
  • Update the autogenerated .pyi file header to cite mypy-protobuf
  • Reorganize mypy-protobuf testsuite files to more closely match autogeneration into a generated directory
  • Remove incorrect type___ prefixed alias for inner enum type wrappers
  • Add support for extension fields in proto2 messages
  • Overwrite typing for Message.Extensions mapping to support better type inference for proto2 message extensions
  • Support Message.HasExtension and Message.ClearExtension
  • Bump python-protobuf from 3.11.3 to 3.13.0
  • Add support for optional proto3 fields
  • Support ScalarMap and MessageMap generated types for map types in proto. This will allow us to support get_or_create
message Message {
    map<int32, OuterMessage3> map_message = 17
}

and

message.map_message.get_or_create(0)

Before (1.23)

main.py:4: error: "MutableMapping[str, Nested]" has no attribute "get_or_create"  [attr-defined]

After (1.24) - there is no error

1.23

  • Inherit FromString from superclass Message - rather than re-generating here. Fixes bug in python2 usage google/protobuf/type_pb2.pyi:92: error: Argument 1 of "FromString" is incompatible with supertype "Message"; supertype defines the argument type as "ByteString" [override]

1.22

  • Update tested/required mypy version to 0.780 (picks up new typeshed annotations). Includes improved typing/error messages on Message.

Before (mypy < 0.780):

test_negative/negative.py:26: error: Argument 1 to "CopyFrom" of "Message" has incompatible type "str"; expected "Message"

After (mypy >= 0.780:

test_negative/negative.py:26: error: Argument 1 to "CopyFrom" of "Message" has incompatible type "str"; expected "Simple1"
  • Update generated EnumTypeWrapper to be instances of EnumTypeWrapper - for more consistency with generated python code. Most caller code should not require mypy type changes. Egh ProtoEnum.Value('first') should work either way.

Generated Before (in 1.21)

class ProtoEnum(object):
    @classmethod
    def Value(cls, name: str) -> ProtoEnumValue

Generated After (in 1.22)

ProtoEnum: _ProtoEnum
class _ProtoEnum(google.protobuf.EnumTypeWrapper):
    def Value(self, name: str) -> ProtoEnumValue
  • Remove autogenerated EnumTypeWrapper methods that are redundant to the typeshed parent class. Added testing for these.

1.21

  • Support for module descriptor.
  • Update mangling from global__ to message__
  • Fix bug in message typing for nested enums. Split EnumValue from EnumTypeWrapper. Enforces that constructing an enum value must happen via a NewType wrapper to the int.

Example:

enum ProtoEnum {
    FIRST = 1;
    SECOND = 2;
}

mesage ProtoMsg {
    ProtoEnum enum = 1;
}

Generated Before (in 1.20):

class ProtoEnum(object):
    @classmethod
    def Value(cls, name: str) -> ProtoEnum

class ProtoMsg(Message):
    def __init__(self, enum: ProtoEnum) -> None

Generated After (in 1.21):

ProtoEnumValue = NewType('ProtoEnumValue', int)
class ProtoEnum(object):
    @classmethod
    def Value(cls, name: str) -> ProtoEnumValue

class ProtoMsg(Message):
    def __init__(self, enum: ProtoEnumValue) -> None

Migration Guide (with example calling code)

Before (with 1.20)

from msg_pb2 import ProtoEnum, ProtoMsg

def make_proto_msg(enum: ProtoEnum) -> ProtoMsg:
    return ProtoMsg(enum)
make_proto_msg(ProtoMsg.FIRST)

After (with 1.21)

from msg_pb2 import ProtoEnum, ProtoMsg

def make_proto_msg(enum: 'msg_pb2.ProtoEnumValue') -> ProtoMsg:
    return ProtoMsg(enum)
make_proto_msg(ProtoMsg.FIRST)
  • Use inline-style rather than comment-style typing in the pyi file
  • Remove MergeFrom/CopyFrom from generated code as it is in the Message superclass

1.20

  • Black code formatting
  • Fix message/field name aliasing when field name matches a message/enum name

1.19

  • Allow omitting required proto2 fields from constructor parameters
  • Support and testing for python 3.8
  • Support for python-protobuf to 3.11.3

1.18

  • Use entry_points:console_scripts to support long paths to the python interpreter

1.17

  • Update to newer mypy version - including minor changes to typeshed

1.16

  • Absolute path to necessary python
  • Add forward reference string literal support for enums
  • Alias builtin types to avoid collision with field name

1.15

  • Add class to set of python keywords

1.14

  • Add Message.DESCRIPTOR

Older changelogs not available. Check git log if you need them!