2.0.0 Migration Guide

The 2.0 release of the google-cloud-language client is a significant upgrade based on a next-gen code generator, and includes substantial interface changes. Existing code written for earlier versions of this library will likely require updates to use this version. This document describes the changes that have been made, and what you need to do to update your usage.

If you experience issues or have questions, please file an issue.

Supported Python Versions

WARNING: Breaking change The 2.0.0 release requires Python 3.6+.

Method Calls

WARNING: Breaking change Methods expect request objects. We provide a script that will convert most common use cases.

  • Install the library and libcst.
python3 -m pip install google-cloud-language[libcst]
  • The script fixup_language_v1_keywords.py is shipped with the library. It expects an input directory (with the code to convert) and an empty destination directory.
$ fixup_language_v1_keywords.py --input-directory .samples/ --output-directory samples/


from google.cloud import language_v1
language = language_v1.LanguageClient()
return language.analyze_sentiment(document=document).document_sentiment


from google.cloud import language_v1
language = language_v1.LanguageServiceClient()
return language.analyze_sentiment(request={'document': document}).document_sentiment

More Details

In google-cloud-language<2.0.0, parameters required by the API were positional parameters and optional parameters were keyword parameters.


    def analyze_sentiment(

In the 2.0.0 release, all methods have a single positional parameter request. Method docstrings indicate whether a parameter is required or optional.

Some methods have additional keyword only parameters. The available parameters depend on the google.api.method_signature annotation specified by the API producer.


    def analyze_sentiment(
        request: language_service.AnalyzeSentimentRequest = None,
        document: language_service.Document = None,
        encoding_type: language_service.EncodingType = None,
        retry: retries.Retry = gapic_v1.method.DEFAULT,
        timeout: float = None,
        metadata: Sequence[Tuple[str, str]] = (),
    ) -> language_service.AnalyzeSentimentResponse:

NOTE: The request parameter and flattened keyword parameters for the API are mutually exclusive. Passing both will result in an error. Both of these calls are valid:

response = client.analyze_sentiment(
        "document": document,
        "encoding_type": encoding_type
response = client.analyze_sentiment(
    )  # Make an API request.

This call is invalid because it mixes request with a keyword argument entry_group. Executing this code will result in an error.

response = client.analyze_sentiment(
        "document": document

Enums and Types

WARNING: Breaking change The submodules enums and types have been removed. Before:

from google.cloud import language_v1
document = language_v1.types.Document(content=text, type=language_v1.enums.Document.Type.PLAIN_TEXT)
encoding_type = language_v1.enums.EncodingType.UTF8


from google.cloud import language_v1
document = language_v1.Document(content=text, type_=language_v1.Document.Type.PLAIN_TEXT)
encoding_type = language_v1.EncodingType.UTF8

Project Path Helper Methods

The project path helper method project_path has been removed. Please construct this path manually.

project = 'my-project'
project_path = f'projects/{project}'