jsons.JsonSerializable.load() - Code Metrics - Inspection of "Fixed a bug in property. Also added load and dump..." - ramonhagenaars/jsons - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 9adf86...b4eeac )

by Ramon

created 2018-07-20 09:59 UTC

jsons.JsonSerializable.load() A

↳ Parent: jsons

Complexity

Conditions

Size

Total Lines	9
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	3
nop	3
dl	0
loc	9
rs	10
c	0
b	0
f	0

"""
Works with Python3.5+

JSON (de)serialization (jsons) from and to dicts and plain old Python objects.

Works with dataclasses (Python3.7+).


**Example:**

    >>> from dataclasses import dataclass
    >>> @dataclass
    ... class Car:
    ...     color: str
    >>> @dataclass
    ... class Person:
    ...     car: Car
    ...     name: str
    >>> c = Car('Red')
    >>> p = Person(c, 'John')
    >>> dumped = dump(p)
    >>> dumped['name']
    'John'
    >>> dumped['car']['color']
    'Red'
    >>> p_reloaded = load(dumped, Person)
    >>> p_reloaded.name
    'John'
    >>> p_reloaded.car.color
    'Red'


Deserialization will work with older Python classes (Python3.5+) given that
type hints are present for custom types (i.e. any type that is not set at
the bottom of this module). Serialization will work with no type hints at
all.


**Example**

    >>> class Car:
    ...     def __init__(self, color):
    ...         self.color = color
    >>> class Person:
    ...     def __init__(self, car: Car, name):
    ...         self.car = car
    ...         self.name = name
    >>> c = Car('Red')
    >>> p = Person(c, 'John')
    >>> dumped = dump(p)
    >>> dumped['name']
    'John'
    >>> dumped['car']['color']
    'Red'
    >>> p_reloaded = load(dumped, Person)
    >>> p_reloaded.name
    'John'
    >>> p_reloaded.car.color
    'Red'


Alternatively, you can make use of the `JsonSerializable` class.


**Example**

    >>> class Car(JsonSerializable):
    ...     def __init__(self, color):
    ...         self.color = color
    >>> class Person(JsonSerializable):
    ...     def __init__(self, car: Car, name):
    ...         self.car = car
    ...         self.name = name
    >>> c = Car('Red')
    >>> p = Person(c, 'John')
    >>> dumped = p.json
    >>> dumped['name']
    'John'
    >>> dumped['car']['color']
    'Red'
    >>> p_reloaded = Person.from_json(dumped)
    >>> p_reloaded.name
    'John'
    >>> p_reloaded.car.color
    'Red'

"""
import json
from datetime import datetime
from enum import Enum
from jsons._common_impl import dump_impl, load_impl, CLASSES, SERIALIZERS, \
    DESERIALIZERS
from jsons.deserializers import default_list_deserializer, \
    default_enum_deserializer, default_datetime_deserializer, \
    default_string_deserializer, default_primitive_deserializer, \
    default_object_deserializer, default_dict_deserializer
from jsons.serializers import default_list_serializer, \
    default_enum_serializer, default_datetime_serializer, \
    default_primitive_serializer, default_object_serializer, \
    KEY_TRANSFORMER_SNAKECASE, KEY_TRANSFORMER_CAMELCASE, \
    KEY_TRANSFORMER_PASCALCASE, KEY_TRANSFORMER_LISPCASE, \
    default_dict_serializer

dump = dump_impl

load = load_impl



def dumps(obj: object, *args, **kwargs) -> str:
    """
    Extend ``json.dumps``, allowing any Python instance to be dumped to a
    string. Any extra (keyword) arguments are passed on to ``json.dumps``.

    :param obj: the object that is to be dumped to a string.
    :param args: extra arguments for ``json.dumps``.
    :param kwargs: extra keyword arguments for ``json.dumps``. They are also
    passed on to the serializer function.
    :return: ``obj`` as a ``str``.
    """
    return json.dumps(dump(obj, **kwargs), *args, **kwargs)


def loads(s: str, cls: type = None, *args, **kwargs) -> object:

    """
    Extend ``json.loads``, allowing a string to be loaded into a dict or a
    Python instance of type ``cls``. Any extra (keyword) arguments are passed
    on to ``json.loads``.

    :param s: the string that is to be loaded.
    :param cls: a matching class of which an instance should be returned.
    :param args: extra arguments for ``json.dumps``.
    :param kwargs: extra keyword arguments for ``json.dumps``. They are also
    passed on to the deserializer function.
    :return: an instance of type ``cls`` or a dict if no ``cls`` is given.
    """
    obj = json.loads(s, *args, **kwargs)
    return load(obj, cls, **kwargs) if cls else obj


def set_serializer(c: callable, cls: type, high_prio: bool = True) -> None:

    """
    Set a serializer function for the given type. You may override the default
    behavior of ``jsons.load`` by setting a custom serializer.

    :param c: the serializer function.
    :param cls: the type this serializer can handle.
    :param high_prio: determines the order in which is looked for the callable.
    :return: None.
    """
    if cls:
        index = 0 if high_prio else len(CLASSES)
        CLASSES.insert(index, cls)
        SERIALIZERS[cls.__name__] = c
    else:
        SERIALIZERS['NoneType'] = c


def set_deserializer(c: callable, cls: type, high_prio: bool = True) -> None:

    """
    Set a deserializer function for the given type. You may override the
    default behavior of ``jsons.dump`` by setting a custom deserializer.

    :param c: the deserializer function.
    :param cls: the type this serializer can handle.
    :param high_prio: determines the order in which is looked for the callable.
    :return: None.
    """
    if cls:
        index = 0 if high_prio else len(CLASSES)
        CLASSES.insert(index, cls)
        DESERIALIZERS[cls.__name__] = c
    else:
        DESERIALIZERS['NoneType'] = c


class JsonSerializable:

    """
    This class offers an alternative to using the `jsons.load` and `jsons.dump`
    methods. An instance of a class that inherits from JsonSerializable has the
    `json` property, which value is equivalent to calling `jsons.dump` on that
    instance. Furthermore, you can call `from_json` on that class, which is
    equivalent to calling `json.load` with that class as an argument.
    """
    @property
    def json(self) -> dict:
        """
        See `jsons.dump`.
        :return: this instance in a JSON representation (dict).
        """
        return dump(self)

    @classmethod
    def from_json(cls: type, json_obj: dict, **kwargs) -> object:
        """
        See `jsons.load`.
        :param json_obj: a JSON representation of an instance of the inheriting
        class
        :param kwargs: the keyword args are passed on to the deserializer
        function.
        :return: an instance of the inheriting class.
        """
        return load(json_obj, cls, **kwargs)

    def dump(self, **kwargs) -> dict:
        """
        See `jsons.dump`.
        :param kwargs: the keyword args are passed on to the serializer
        function.
        :return: this instance in a JSON representation (dict).
        """
        return dump(self, **kwargs)

    @classmethod
    def load(cls: type, json_obj: dict, **kwargs) -> object:
        """
        See `jsons.load`.
        :param kwargs: the keyword args are passed on to the serializer
        function.
        :return: this instance in a JSON representation (dict).
        """
        return load(json_obj, cls, **kwargs)


set_serializer(default_list_serializer, list)
set_serializer(default_dict_serializer, dict)
set_serializer(default_enum_serializer, Enum)
set_serializer(default_datetime_serializer, datetime)
set_serializer(default_primitive_serializer, str)
set_serializer(default_primitive_serializer, int)
set_serializer(default_primitive_serializer, float)
set_serializer(default_primitive_serializer, bool)
set_serializer(default_primitive_serializer, None)
set_serializer(default_object_serializer, object, False)
set_deserializer(default_list_deserializer, list)
set_deserializer(default_dict_deserializer, dict)
set_deserializer(default_enum_deserializer, Enum)
set_deserializer(default_datetime_deserializer, datetime)
set_deserializer(default_string_deserializer, str)
set_deserializer(default_primitive_deserializer, int)
set_deserializer(default_primitive_deserializer, float)
set_deserializer(default_primitive_deserializer, bool)
set_deserializer(default_primitive_deserializer, None)
set_deserializer(default_object_deserializer, object, False)


1			"""
2			Works with Python3.5+
3
4			JSON (de)serialization (jsons) from and to dicts and plain old Python objects.
5
6			Works with dataclasses (Python3.7+).
7
8
9			Example:
10
11			>>> from dataclasses import dataclass
12			>>> @dataclass
13			... class Car:
14			... color: str
15			>>> @dataclass
16			... class Person:
17			... car: Car
18			... name: str
19			>>> c = Car('Red')
20			>>> p = Person(c, 'John')
21			>>> dumped = dump(p)
22			>>> dumped['name']
23			'John'
24			>>> dumped['car']['color']
25			'Red'
26			>>> p_reloaded = load(dumped, Person)
27			>>> p_reloaded.name
28			'John'
29			>>> p_reloaded.car.color
30			'Red'
31
32
33			Deserialization will work with older Python classes (Python3.5+) given that
34			type hints are present for custom types (i.e. any type that is not set at
35			the bottom of this module). Serialization will work with no type hints at
36			all.
37
38
39			Example
40
41			>>> class Car:
42			... def __init__(self, color):
43			... self.color = color
44			>>> class Person:
45			... def __init__(self, car: Car, name):
46			... self.car = car
47			... self.name = name
48			>>> c = Car('Red')
49			>>> p = Person(c, 'John')
50			>>> dumped = dump(p)
51			>>> dumped['name']
52			'John'
53			>>> dumped['car']['color']
54			'Red'
55			>>> p_reloaded = load(dumped, Person)
56			>>> p_reloaded.name
57			'John'
58			>>> p_reloaded.car.color
59			'Red'
60
61
62			Alternatively, you can make use of the `JsonSerializable` class.
63
64
65			Example
66
67			>>> class Car(JsonSerializable):
68			... def __init__(self, color):
69			... self.color = color
70			>>> class Person(JsonSerializable):
71			... def __init__(self, car: Car, name):
72			... self.car = car
73			... self.name = name
74			>>> c = Car('Red')
75			>>> p = Person(c, 'John')
76			>>> dumped = p.json
77			>>> dumped['name']
78			'John'
79			>>> dumped['car']['color']
80			'Red'
81			>>> p_reloaded = Person.from_json(dumped)
82			>>> p_reloaded.name
83			'John'
84			>>> p_reloaded.car.color
85			'Red'
86
87			"""
88			import json
89			from datetime import datetime
90			from enum import Enum
91			from jsons._common_impl import dump_impl, load_impl, CLASSES, SERIALIZERS, \
92			DESERIALIZERS
93			from jsons.deserializers import default_list_deserializer, \
94			default_enum_deserializer, default_datetime_deserializer, \
95			default_string_deserializer, default_primitive_deserializer, \
96			default_object_deserializer, default_dict_deserializer
97			from jsons.serializers import default_list_serializer, \
98			default_enum_serializer, default_datetime_serializer, \
99			default_primitive_serializer, default_object_serializer, \
100			KEY_TRANSFORMER_SNAKECASE, KEY_TRANSFORMER_CAMELCASE, \
101			KEY_TRANSFORMER_PASCALCASE, KEY_TRANSFORMER_LISPCASE, \
102			default_dict_serializer
103
104			dump = dump_impl
			0 ignored issues – show Coding Style Naming introduced 2018-07-20 08:00 UTC by Report Bug Copy Issue Report The name `dump` does not conform to the constant naming conventions (`(([A-Z_][A-Z0-9_])\|(__.__))$`). This check looks for invalid names for a range of different identifiers. You can set regular expressions to which the identifiers must conform if the defaults do not match your requirements. If your project includes a Pylint configuration file, the settings contained in that file take precedence. To find out more about Pylint, please refer to their site. Loading history...
105			load = load_impl
			0 ignored issues – show Coding Style Naming introduced 2018-07-18 19:18 UTC by Report Bug Copy Issue Report The name `load` does not conform to the constant naming conventions (`(([A-Z_][A-Z0-9_])\|(__.__))$`). This check looks for invalid names for a range of different identifiers. You can set regular expressions to which the identifiers must conform if the defaults do not match your requirements. If your project includes a Pylint configuration file, the settings contained in that file take precedence. To find out more about Pylint, please refer to their site. Loading history...
106
107
108			def dumps(obj: object, args, *kwargs) -> str:
109			"""
110			Extend ``json.dumps``, allowing any Python instance to be dumped to a
111			string. Any extra (keyword) arguments are passed on to ``json.dumps``.
112
113			:param obj: the object that is to be dumped to a string.
114			:param args: extra arguments for ``json.dumps``.
115			:param kwargs: extra keyword arguments for ``json.dumps``. They are also
116			passed on to the serializer function.
117			:return: ``obj`` as a ``str``.
118			"""
119			return json.dumps(dump(obj, *kwargs), args, **kwargs)
120
121
122			def loads(s: str, cls: type = None, args, *kwargs) -> object:
			0 ignored issues – show Coding Style Naming introduced 2018-07-18 19:18 UTC by Report Bug Copy Issue Report The name `s` does not conform to the argument naming conventions (`(([a-z][a-z0-9_]{2,30})\|(_[a-z0-9_]*))$`). This check looks for invalid names for a range of different identifiers. You can set regular expressions to which the identifiers must conform if the defaults do not match your requirements. If your project includes a Pylint configuration file, the settings contained in that file take precedence. To find out more about Pylint, please refer to their site. Loading history...
123			"""
124			Extend ``json.loads``, allowing a string to be loaded into a dict or a
125			Python instance of type ``cls``. Any extra (keyword) arguments are passed
126			on to ``json.loads``.
127
128			:param s: the string that is to be loaded.
129			:param cls: a matching class of which an instance should be returned.
130			:param args: extra arguments for ``json.dumps``.
131			:param kwargs: extra keyword arguments for ``json.dumps``. They are also
132			passed on to the deserializer function.
133			:return: an instance of type ``cls`` or a dict if no ``cls`` is given.
134			"""
135			obj = json.loads(s, args, *kwargs)
136			return load(obj, cls, **kwargs) if cls else obj
137
138
139			def set_serializer(c: callable, cls: type, high_prio: bool = True) -> None:
			0 ignored issues – show Coding Style Naming introduced 2018-07-18 19:18 UTC by Report Bug Copy Issue Report The name `c` does not conform to the argument naming conventions (`(([a-z][a-z0-9_]{2,30})\|(_[a-z0-9_]*))$`). This check looks for invalid names for a range of different identifiers. You can set regular expressions to which the identifiers must conform if the defaults do not match your requirements. If your project includes a Pylint configuration file, the settings contained in that file take precedence. To find out more about Pylint, please refer to their site. Loading history...
140			"""
141			Set a serializer function for the given type. You may override the default
142			behavior of ``jsons.load`` by setting a custom serializer.
143
144			:param c: the serializer function.
145			:param cls: the type this serializer can handle.
146			:param high_prio: determines the order in which is looked for the callable.
147			:return: None.
148			"""
149			if cls:
150			index = 0 if high_prio else len(CLASSES)
151			CLASSES.insert(index, cls)
152			SERIALIZERS[cls.__name__] = c
153			else:
154			SERIALIZERS['NoneType'] = c
155
156
157			def set_deserializer(c: callable, cls: type, high_prio: bool = True) -> None:
			0 ignored issues – show Coding Style Naming introduced 2018-07-18 19:18 UTC by Report Bug Copy Issue Report The name `c` does not conform to the argument naming conventions (`(([a-z][a-z0-9_]{2,30})\|(_[a-z0-9_]*))$`). This check looks for invalid names for a range of different identifiers. You can set regular expressions to which the identifiers must conform if the defaults do not match your requirements. If your project includes a Pylint configuration file, the settings contained in that file take precedence. To find out more about Pylint, please refer to their site. Loading history...
158			"""
159			Set a deserializer function for the given type. You may override the
160			default behavior of ``jsons.dump`` by setting a custom deserializer.
161
162			:param c: the deserializer function.
163			:param cls: the type this serializer can handle.
164			:param high_prio: determines the order in which is looked for the callable.
165			:return: None.
166			"""
167			if cls:
168			index = 0 if high_prio else len(CLASSES)
169			CLASSES.insert(index, cls)
170			DESERIALIZERS[cls.__name__] = c
171			else:
172			DESERIALIZERS['NoneType'] = c
173
174
175			class JsonSerializable:
			0 ignored issues – show Unused Code introduced 2018-07-18 19:18 UTC by Report Bug Copy Issue Report The variable `__class__` seems to be unused. Loading history...
176			"""
177			This class offers an alternative to using the `jsons.load` and `jsons.dump`
178			methods. An instance of a class that inherits from JsonSerializable has the
179			`json` property, which value is equivalent to calling `jsons.dump` on that
180			instance. Furthermore, you can call `from_json` on that class, which is
181			equivalent to calling `json.load` with that class as an argument.
182			"""
183			@property
184			def json(self) -> dict:
185			"""
186			See `jsons.dump`.
187			:return: this instance in a JSON representation (dict).
188			"""
189			return dump(self)
190
191			@classmethod
192			def from_json(cls: type, json_obj: dict, **kwargs) -> object:
193			"""
194			See `jsons.load`.
195			:param json_obj: a JSON representation of an instance of the inheriting
196			class
197			:param kwargs: the keyword args are passed on to the deserializer
198			function.
199			:return: an instance of the inheriting class.
200			"""
201			return load(json_obj, cls, **kwargs)
202
203			def dump(self, **kwargs) -> dict:
204			"""
205			See `jsons.dump`.
206			:param kwargs: the keyword args are passed on to the serializer
207			function.
208			:return: this instance in a JSON representation (dict).
209			"""
210			return dump(self, **kwargs)
211
212			@classmethod
213			def load(cls: type, json_obj: dict, **kwargs) -> object:
214			"""
215			See `jsons.load`.
216			:param kwargs: the keyword args are passed on to the serializer
217			function.
218			:return: this instance in a JSON representation (dict).
219			"""
220			return load(json_obj, cls, **kwargs)
221
222
223			set_serializer(default_list_serializer, list)
224			set_serializer(default_dict_serializer, dict)
225			set_serializer(default_enum_serializer, Enum)
226			set_serializer(default_datetime_serializer, datetime)
227			set_serializer(default_primitive_serializer, str)
228			set_serializer(default_primitive_serializer, int)
229			set_serializer(default_primitive_serializer, float)
230			set_serializer(default_primitive_serializer, bool)
231			set_serializer(default_primitive_serializer, None)
232			set_serializer(default_object_serializer, object, False)
233			set_deserializer(default_list_deserializer, list)
234			set_deserializer(default_dict_deserializer, dict)
235			set_deserializer(default_enum_deserializer, Enum)
236			set_deserializer(default_datetime_deserializer, datetime)
237			set_deserializer(default_string_deserializer, str)
238			set_deserializer(default_primitive_deserializer, int)
239			set_deserializer(default_primitive_deserializer, float)
240			set_deserializer(default_primitive_deserializer, bool)
241			set_deserializer(default_primitive_deserializer, None)
242			set_deserializer(default_object_deserializer, object, False)
243

ramonhagenaars / jsons

Push — master ( 9adf86...b4eeac )

jsons.JsonSerializable.load() A

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Duplication

Importance

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