Typing stubs for grpcio

1.0.0.20260408 · active · verified Sat Apr 11

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.

Warnings

gotcha 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.
Fix: Ensure both `grpcio` and `types-grpcio` are installed: `pip install grpcio types-grpcio`.
gotcha 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.
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.
gotcha 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.
Fix: Consult the `mypy-protobuf` documentation or `mypy`'s documentation for correctly type checking custom generated gRPC code.

Install

pip install types-grpcio Install `types-grpcio`

Imports

grpc
```
import grpc
```
This library provides type hints for the 'grpc' library. Users import 'grpc', and type checkers like MyPy use these stubs to perform static analysis.

Quickstart

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.

import grpc
from typing import cast

# To make this example runnable, you would typically have:
# 1. A .proto file defining a service (e.g., helloworld.proto)
# 2. Generated Python code for the service (e.g., helloworld_pb2.py, helloworld_pb2_grpc.py)
#    using `python -m grpc_tools.protoc ...`

def demonstrate_typing():
    # types-grpcio provides type hints for grpc functions and objects.
    # For instance, `grpc.insecure_channel` is correctly typed.
    channel: grpc.Channel = grpc.insecure_channel('localhost:50051')
    print(f"Successfully created a gRPC channel: {type(channel).__name__}")

    # With types-grpcio, static analysis tools like MyPy can verify
    # that `channel` is indeed a `grpc.Channel` object and that its methods are correct.
    # Example (would require generated stubs for full type checking):
    # from helloworld_pb2_grpc import GreeterStub
    # stub: GreeterStub = GreeterStub(channel)
    # print("Type hints for gRPC stub are available.")

    channel.close()

if __name__ == '__main__':
    demonstrate_typing()

# To verify types with MyPy:
# 1. Ensure `grpcio`, `types-grpcio`, and `mypy` are installed:
#    `pip install grpcio types-grpcio mypy`
# 2. Run MyPy on this file:
#    `mypy your_script_name.py`
# MyPy should report no errors for the `grpc` types.

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