feat(Python bindings): Add utilty functions for converting to/from JSON

python/util.py

@@ -0,0 +1,32 @@
+import json
+import .types
+from .types import Node, Thing
+
+# TODO: Use Entity instead of Thing
+# When https://github.com/stencila/schema/issues/96 is done
+
+def toDict(node: Thing) -> dict:
+    """Convert a Thing node to a dictionary"""
+    node_dict = {
+        "type": node.__class__.__name__
+    }
+    node_dict.update(node.__dict__)
+    return node_dict
+
+def fromDict(node_dict: dict) -> Thing:
+    """Convert a dictionary to a Thing node"""
+    if "type" in node_dict:
+        class_ = getattr(types, node_dict["type"])
+        return class_(**node_dict)
+    else:
+        return node_dict
+
+def toJSON(node: Node) -> str:
+    """Convert a node to JSON"""
+    return json.dumps(node, default=toDict, indent=2)
+
+def fromJSON(json: str) -> Node:
+    """Convert JSON to a Node"""
+    node = json.loads(json)
+    if isinstance(node, dict): return fromDict(node)
+    else return node

tests/article.py

@@ -1,4 +1,5 @@
 from python.types import Article, Person, Paragraph
+from python.util import toJSON
 
 article = Article(
     title='',
@@ -12,3 +13,4 @@
     ]
 )
 
+print(toJSON(article))