Documentation of prance 0.8.0

Swagger/OpenAPI 2.0 Parser for Python

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Prance provides parsers for Swagger/OpenAPI 2.0 API specifications in Python. It uses swagger_spec_validator to validate specifications, but additionally resolves JSON references in accordance with the Swagger spec.

Mostly the latter involves handling non-URI references; Swagger is fine with providing relative file paths, whereas JSON references require URIs at this point in time.

Usage

Command Line Interface

After installing prance, a CLI is available for validating (and resolving external references in) specs:

# Validates with resolving
$ prance validate path/to/swagger.yml

# Validates without resolving
$ prance validate --no-resolve path/to/swagger.yml

# Validates and resolves, and writes the results to output.yaml
$ prance validate -o output.yaml path/to/swagger.yml

# Fetch URL, validate and resolve.
$ prance validate http://petstore.swagger.io/v2/swagger.json
Processing "http://petstore.swagger.io/v2/swagger.json"...
 -> Resolving external references.
Validates OK as Swagger/OpenAPI 2.0!

Code

Most likely you have spec file and want to parse it:

from prance import ResolvingParser
parser = ResolvingParser('path/to/my/swagger.yaml')
parser.specification  # contains fully resolved specs as a dict

Prance also includes a non-resolving parser that does not follow JSON references, in case you prefer that.

from prance import BaseParser
parser = BaseParser('path/to/my/swagger.yaml')
parser.specification  # contains specs as a dict still containing JSON references

On Windows, the code reacts correctly if you pass posix-like paths (/c:/swagger) or if the path is relative. If you pass absolute windows path (like c:\swagger.yaml), you can use prance.util.fs.abspath to convert them.

URLs can also be parsed:

parser = ResolvingParser('http://petstore.swagger.io/v2/swagger.json')

Largely, that’s it. There is a whole slew of utility code that you may or may not find useful, too. Look at the full documentation for details.

Compatibility

As of version 0.8, we’re using flex as the default validation backend. The previous swagger-spec-validator still works, if you installed with the ssv dependencies.

You can select the backend in the constructor of the parser(s):

parser = ResolvingParser('http://petstore.swagger.io/v2/swagger.json', backend = 'swagger-spec-validator')

Note that the flex validator simply accepts integer status codes, despite them not being valid JSON. See issue #5 for details. Therefore, flex also does not support the strict option.

Contributing

See CONTRIBUTING.md for details.

License

Licensed under MITNFA (MIT +no-false-attribs) License. See the LICENSE.txt file for details.

API/Modules

prance Prance implements parsers for Swagger/OpenAPI 2.0 API specs.
prance.mixins Defines Mixins for parsers.
prance.util.formats This submodule contains file format related utility code for Prance.
prance.util.fs This submodule contains file system utilities for Prance.
prance.util.iterators This submodule contains specialty iterators over specs.
prance.util.resolver This submodule contains a JSON reference resolver.
prance.util.url This submodule contains code for fetching/parsing URLs.