# jsonify¶

PyPhi- and NumPy-aware JSON serialization.

To be properly serialized and deserialized, PyPhi objects must implement a to_json method which returns a dictionary of attribute names and attribute values. These attributes should be the names of arguments passed to the object constructor. If the constructor takes additional, fewer, or different arguments, the object needs to implement a custom classmethod called from_json that takes a Python dictionary as an argument and returns a PyPhi object. For example:

class Phi:
def __init__(self, phi):
self.phi = phi

def to_json(self):
return {'phi': self.phi, 'twice_phi': 2 * self.phi}

@classmethod
def from_json(cls, json):
return Phi(json['phi'])


The object must also be added to jsonify._loadable_models.

The JSON encoder adds the name of the object and the current PyPhi version to the JSON stream. The JSON decoder uses this metadata to recursively deserialize the stream to a nested PyPhi object structure. The decoder will raise an exception if current PyPhi version doesn’t match the version in the JSON data.

pyphi.jsonify.jsonify(obj)

Return a JSON-encodable representation of an object, recursively using any available to_json methods, converting NumPy arrays and datatypes to native lists and types along the way.

class pyphi.jsonify.PyPhiJSONEncoder(*, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, sort_keys=False, indent=None, separators=None, default=None)

JSONEncoder that allows serializing PyPhi objects with jsonify.

Constructor for JSONEncoder, with sensible defaults.

If skipkeys is false, then it is a TypeError to attempt encoding of keys that are not str, int, float or None. If skipkeys is True, such items are simply skipped.

If ensure_ascii is true, the output is guaranteed to be str objects with all incoming non-ASCII characters escaped. If ensure_ascii is false, the output can contain non-ASCII characters.

If check_circular is true, then lists, dicts, and custom encoded objects will be checked for circular references during encoding to prevent an infinite recursion (which would cause an OverflowError). Otherwise, no such check takes place.

If allow_nan is true, then NaN, Infinity, and -Infinity will be encoded as such. This behavior is not JSON specification compliant, but is consistent with most JavaScript based encoders and decoders. Otherwise, it will be a ValueError to encode such floats.

If sort_keys is true, then the output of dictionaries will be sorted by key; this is useful for regression tests to ensure that JSON serializations can be compared on a day-to-day basis.

If indent is a non-negative integer, then JSON array elements and object members will be pretty-printed with that indent level. An indent level of 0 will only insert newlines. None is the most compact representation.

If specified, separators should be an (item_separator, key_separator) tuple. The default is (’, ‘, ‘: ‘) if indent is None and (‘,’, ‘: ‘) otherwise. To get the most compact JSON representation, you should specify (‘,’, ‘:’) to eliminate whitespace.

If specified, default is a function that gets called for objects that can’t otherwise be serialized. It should return a JSON encodable version of the object or raise a TypeError.

encode(obj)

Encode the output of jsonify with the default encoder.

iterencode(obj, **kwargs)

Analog to encode used by json.dump.

pyphi.jsonify.dumps(obj, **user_kwargs)

Serialize obj as JSON-formatted stream.

pyphi.jsonify.dump(obj, fp, **user_kwargs)

Serialize obj as a JSON-formatted stream and write to fp (a .write()-supporting file-like object.

class pyphi.jsonify.PyPhiJSONDecoder(*args, **kwargs)

Extension of the default encoder which automatically deserializes PyPhi JSON to the appropriate model classes.

object_hook, if specified, will be called with the result of every JSON object decoded and its return value will be used in place of the given dict. This can be used to provide custom deserializations (e.g. to support JSON-RPC class hinting).

object_pairs_hook, if specified will be called with the result of every JSON object decoded with an ordered list of pairs. The return value of object_pairs_hook will be used instead of the dict. This feature can be used to implement custom decoders. If object_hook is also defined, the object_pairs_hook takes priority.

parse_float, if specified, will be called with the string of every JSON float to be decoded. By default this is equivalent to float(num_str). This can be used to use another datatype or parser for JSON floats (e.g. decimal.Decimal).

parse_int, if specified, will be called with the string of every JSON int to be decoded. By default this is equivalent to int(num_str). This can be used to use another datatype or parser for JSON integers (e.g. float).

parse_constant, if specified, will be called with one of the following strings: -Infinity, Infinity, NaN. This can be used to raise an exception if invalid JSON numbers are encountered.

If strict is false (true is the default), then control characters will be allowed inside strings. Control characters in this context are those with character codes in the 0-31 range, including '\t' (tab), '\n', '\r' and '\0'.