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Mypy-friendly boto3 type annotations for elasticache service.

Project description


Mypy-friendly type annotations for boto3.


# install only `mypy_boto3.s3` for S3 service annotations
pip install mypy-boto3[s3]

# or install multiple services
pip install mypy-boto3[s3][ec2]

# or install S3 service with docs
pip install mypy-boto3[s3-with-docs]

# or install all services
pip install mypy-boto3[all]

# or even install all boto3 services annotations
# WARNING: this will eat ~70 MB of space
pip install mypy-boto3[all-with-docs]


  • Install mypy and optionally enable it in your IDE

  • Install boto3

  • Use mypy-boto3 to annotate your code to discover errors

    import boto3
    from mypy_boto3.s3 import Client, ServiceResource
    client: Client = boto3.client("s3")
    # IDE autocomplete suggests function name and arguemnts here
    # (mypy) error: Missing positional argument "Key" in call to "get_object" of "Client"
    # (mypy) error: Argument "Key" to "get_object" of "Client" has incompatible type "None"; expected "str"
    client.get_object(Bucket="bucket", Key=None)
    # explicitly set type to S3 ServiceResource
    resource: ServiceResource = boto3.Session(region_name="us-west-1").resource("s3")
    # IDE autocomplete suggests function name and arguments here
    bucket = resource.Bucket("bucket")
    # (mypy) error: Unexpected keyword argument "key" for "upload_file" of "Bucket"
    bucket.upload_file(Filename="my.txt", key="my-txt")

How it works

There is also a package mypy-boto3-builder that builds interface files from boto3 documentation.

Differences from boto3-type-annotations

  • Fully type annotated
  • mypy compatibility
  • Generated types for return values and arguments
  • Added ServiceResource sub-collections
  • Support service-specific sub-modules (in progress)
  • CLI interface for builder
  • Modules documentation

What's next

  • Add TypedDict types for arguments and return types to check keys and values
  • Allow installation of sub-modules
  • Always include docs and support them in generated documentation

Thank you

  • Guys behind boto3-type-annotations, this package is based on top of their work
  • black developers for awesome formatting tool
  • mypy for doing all dirty work for us

Project details

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