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A Python OpenAPI 3 Specification client and validator for Python 3.

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Validation Mode

This module can be run against a spec file to validate it like so:

python3 -m openapi3 /path/to/spec

Usage as a Client

This library also functions as an interactive client for arbitrary OpenAPI 3 specs. For example, using Linode's OpenAPI 3 Specification for reference:

from openapi3 import OpenAPI
import yaml

# load the spec file and read the yaml
with open('openapi.yaml') as f:
    spec = yaml.safe_load(

# parse the spec into python - this will raise if the spec is invalid
api = OpenAPI(spec)

# call operations and receive result models
regions = api.call_getRegions()

# authenticate using a securityScheme defined in the spec's components.securitySchemes
api.authenticate('personalAccessToken', my_token)

# call an operation that requires authentication
linodes  = api.call_getLinodeInstances()

# call an operation with parameters
linode = api.call_getLinodeInstance(parameters={"linodeId": 123})

# the models returns are all of the same (generated) type
print(type(linode))                      # openapi.schemas.Linode
type(linode) == type([0])    # True

# call an operation with a request body
new_linode = api.call_createLinodeInstance(data={"region":"us-east","type":"g6-standard-2"})

# the returned models is still of the correct type
type(new_linode) == type(linode)     # True

HTTP basic authentication and HTTP digest authentication works like this:

# authenticate using a securityScheme defined in the spec's components.securitySchemes
# Tuple with (username, password) as second argument
api.authenticate('basicAuth', ('username', 'password'))

Running Tests

This project includes a test suite, run via pytest. To run the test suite, ensure that you've installed the dependencies and then run pytest in the root of this project.


The following features are planned for the future:

  • Request body models, creation, and validation.
  • Parameters interface with validation and explicit typing.
  • Support for more authentication types.
  • Support for non-json request/response content.
  • Full support for all objects defined in the specification.