{"id":3303,"library":"types-grpcio","title":"Typing stubs for grpcio","description":"This library provides high-quality type stubs for the `grpcio` Python library, enabling static type checkers like MyPy to understand gRPC-related code. It's part of the `typeshed` project. The current version is 1.0.0.20260408, with releases typically following updates from the main `grpcio` library or the broader `typeshed` project, often on a monthly or bi-monthly basis.","status":"active","version":"1.0.0.20260408","language":"en","source_language":"en","source_url":"https://github.com/python/typeshed","tags":["typing","stubs","grpc","typeshed","mypy","static-analysis"],"install":[{"cmd":"pip install types-grpcio","lang":"bash","label":"Install `types-grpcio`"}],"dependencies":[{"reason":"Provides type stubs for the `grpcio` library; it is functionally useless without `grpcio` itself installed.","package":"grpcio","optional":false}],"imports":[{"note":"This library provides type hints for the 'grpc' library. Users import 'grpc', and type checkers like MyPy use these stubs to perform static analysis.","symbol":"grpc","correct":"import grpc"}],"quickstart":{"code":"import grpc\nfrom typing import cast\n\n# To make this example runnable, you would typically have:\n# 1. A .proto file defining a service (e.g., helloworld.proto)\n# 2. Generated Python code for the service (e.g., helloworld_pb2.py, helloworld_pb2_grpc.py)\n#    using `python -m grpc_tools.protoc ...`\n\ndef demonstrate_typing():\n    # types-grpcio provides type hints for grpc functions and objects.\n    # For instance, `grpc.insecure_channel` is correctly typed.\n    channel: grpc.Channel = grpc.insecure_channel('localhost:50051')\n    print(f\"Successfully created a gRPC channel: {type(channel).__name__}\")\n\n    # With types-grpcio, static analysis tools like MyPy can verify\n    # that `channel` is indeed a `grpc.Channel` object and that its methods are correct.\n    # Example (would require generated stubs for full type checking):\n    # from helloworld_pb2_grpc import GreeterStub\n    # stub: GreeterStub = GreeterStub(channel)\n    # print(\"Type hints for gRPC stub are available.\")\n\n    channel.close()\n\nif __name__ == '__main__':\n    demonstrate_typing()\n\n# To verify types with MyPy:\n# 1. Ensure `grpcio`, `types-grpcio`, and `mypy` are installed:\n#    `pip install grpcio types-grpcio mypy`\n# 2. Run MyPy on this file:\n#    `mypy your_script_name.py`\n# MyPy should report no errors for the `grpc` types.","lang":"python","description":"This quickstart demonstrates how `types-grpcio` enables static type checking for common `grpcio` operations, ensuring type correctness during development. It shows the basic usage of `grpc.insecure_channel` and explains how type checkers benefit from the installed stubs."},"warnings":[{"fix":"Ensure both `grpcio` and `types-grpcio` are installed: `pip install grpcio types-grpcio`.","message":"Remember to install the `grpcio` runtime library itself. `types-grpcio` provides only type hints and is not a runtime dependency; your application will fail at runtime if `grpcio` is not installed.","severity":"gotcha","affected_versions":"All"},{"fix":"Keep `types-grpcio` updated, ideally in sync with your `grpcio` installation. `types-grpcio` versions often include a date stamp (e.g., `1.0.0.20260408`) to indicate when they were generated against a specific `grpcio` version or typeshed state.","message":"Using a `types-grpcio` version that is significantly older or newer than your `grpcio` runtime library can lead to incorrect type checking results, `mypy` errors, or missed type safety improvements.","severity":"gotcha","affected_versions":"All"},{"fix":"Consult the `mypy-protobuf` documentation or `mypy`'s documentation for correctly type checking custom generated gRPC code.","message":"Type checking for your own gRPC generated code (from `.proto` files) requires additional configuration for `mypy`, often involving the `mypy-protobuf` plugin or `mypy`'s `--proto-path` flag. `types-grpcio` primarily covers the core `grpcio` library, not your specific service stubs.","severity":"gotcha","affected_versions":"All"}],"env_vars":null,"last_verified":"2026-04-11T00:00:00.000Z","next_check":"2026-07-10T00:00:00.000Z"}