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Python types for Stencila

Project description

Stencila Types for Python

stencila_types

Introduction

This package provides Python classes for types in the Stencila Schema, shortcuts for easily constructing these types, and utilities for loading and saving the types to JSON.

⚡ Usage

Object types

Object types (aka product types) in the Stencila Schema are represented as a dataclass. For example, to construct an article with a single "Hello world!" paragraph, you can construct Article, Paragraph and Text:

from stencila_types.types import Article, CreativeWork, Paragraph, Text, Thing

article = Article(content=[Paragraph(content=[Text(value="Hello world!")])])

assert isinstance(article, Article)
assert isinstance(article, CreativeWork)
assert isinstance(article, Thing)

assert isinstance(article.content[0], Paragraph)

assert isinstance(article.content[0].content[0], Text)

Union types

Union types (aka sum types) in the Stencila Schema are represented as typing.Union. For example, the Block union type is defined like so:

Block = Union[
    Call,
    Claim,
    CodeBlock,
    CodeChunk,
    Division,
    Figure,
    For,
    Form,
    Heading,
...

Enumeration types

Enumeration types in the Stencila Schema are represented as StrEnum. For example, the CitationIntent enumeration is defined like so:

class CitationIntent(StrEnum):
    """
    The type or nature of a citation, both factually and rhetorically.
    """

    AgreesWith = "AgreesWith"
    CitesAsAuthority = "CitesAsAuthority"
    CitesAsDataSource = "CitesAsDataSource"
    CitesAsEvidence = "CitesAsEvidence"
    CitesAsMetadataDocument = "CitesAsMetadataDocument"
    CitesAsPotentialSolution = "CitesAsPotentialSolution"
    CitesAsRecommendedReading = "CitesAsRecommendedReading"
    CitesAsRelated = "CitesAsRelated"

Shortcuts

Constructing complex Stencila types can be more easily constructed using the shortcuts module.

from stencila_types import types as T
from stencila_types import shortcuts as S

# As above
art1 = T.Article(content=[T.Paragraph(content=[T.Text(value="Hello world!")])])

# Using shortcuts
art2 = S.art(S.p("Hello world!"))

assert art1 == art2

Basic JSON support

import json
from stencila_types.utilities import from_json, to_json

# Using shortcuts
art1 = S.art(S.p("Hello world!"))

s = to_json(art1)
assert s.startswith('{"type": "Article", "id": null,')
art2 = from_json(s)

assert art1 == art2

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