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Generate modern Python clients from OpenAPI

Project description

triaxtec Code style: black codecov PyPI version


Generate modern Python clients from OpenAPI

This project is still in early development and does not support all OpenAPI features

Why This?

The Python clients generated by openapi-generator support Python 2 and therefore come with a lot of baggage. This tool aims to generate clients which:

  1. Use all the latest and greatest Python features like type annotations and dataclasses
  2. Don't carry around a bunch of compatibility code for older version of Python (e.g. the six package)
  3. Have better documentation and more obvious usage instructions

Additionally, because this generator is written in Python, it should be more accessible to contribution by the people using it (Python developers).


I recommend you install with pipx so you don't conflict with any other packages you might have: pipx install openapi-python-client.

Better yet, use pipx run openapi-python-client <normal params / options> to always use the latest version of the generator.

You can install with normal pip if you want to though: pip install openapi-python-client

Then, if you want tab completion: openapi-python-client --install-completion


Create a new client

openapi-python-client generate --url

This will generate a new client library named based on the title in your OpenAPI spec. For example, if the title of your API is "My API", the expected output will be "my-api-client". If a folder already exists by that name, you'll get an error.

Update an existing client

openapi-python-client update --url

For more usage details run openapi-python-client --help or read usage

What You Get

  1. A pyproject.toml file with some basic metadata intended to be used with Poetry.
  2. A you'll most definitely need to update with your project's details
  3. A Python module named just like the auto-generated project name (e.g. "my_api_client") which contains:
    1. A client module which will have both a Client class and an AuthenticatedClient class. You'll need these for calling the functions in the api module.
    2. An api module which will contain one module for each tag in your OpenAPI spec, as well as a default module for endpoints without a tag. Each of these modules in turn contains one function for calling each endpoint.
    3. A models module which has all the classes defined by the various schemas in your OpenAPI spec

For a full example you can look at tests/test_end_to_end which has a declared FastAPI server and the resulting openapi.json file in the "fastapi" directory. "golden-master" is the generated client from that OpenAPI document.

OpenAPI features supported

  1. All HTTP Methods
  2. JSON and form bodies, path and query parameters
  3. float, string, int, datetimes, string enums, and custom schemas or lists containing any of those
  4. html/text or application/json responses containing any of the previous types
  5. Bearer token security


You can pass a YAML (or JSON) file to openapi-python-client in order to change some behavior. The following parameters are supported:


Used to change the name of generated model classes, especially useful if you have a name like ABCModel which, when converted to snake case for module naming will be a_b_c_model. This param should be a mapping of existing class name (usually a key in the "schemas" section of your OpenAPI document) to class_name and module_name.


      class_name: ABCModel
      module_name: abc_model

The easiest way to find what needs to be overridden is probably to generate your client and go look at everything in the models folder.


Project details

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