protobuf-typeddict

Tiny tool for generating the TypedDicts describing the protobuf's MessageToDict/ParseDict (aka json) representations.

Some data are better manipulated as simple (typesafe) dicts instead of the python-protobuf's rich objects. Now the protobufs are just the binary serialization library.

Example

Given this ...

message Project {
    optional fixed64 id = 1;
    optional float billing = 2;
    optional bool is_active = 3;
}

message User {
    optional int32 id = 1;
    optional string name = 2;
    repeated string email = 3;
    map<string, Project> project = 4;
}

generates this:

Project = TypedDict(
    "Project",
    {
        "id": NotRequired[int],
        "billing": NotRequired[float],
        "is_active": NotRequired[bool],
    }
)

User = TypedDict(
    "User",
    {
        "id": NotRequired[int],
        "name": NotRequired[str],
        "email": list[str],
        "project": dict[str, "Project"],
    }
)

Installation

The pb2td is not on the PyPI yet. Download the code and run

pip install <path>

Usage

Cli

pb2td installs the script pb2td. Run it as

pb2td src_pb2.py dst.py

to generate the dst.py types.

Programmatic

import my_module_pb2
import pb2td
# the result is str
result = pb2tf.generate(my_module_pb2)
print(result)

NOTE: The pb2td makes TypedDicts from protoc-generated _pb2.py/_pb3.py files, not the .proto.

Limitations

• No RPC/services. Just the plain data protobufs
• No well-known types (datetime etc)
• Enums are typed as int
• No pb2 extensions