anyconfig.backend.json.stdlib
¶
A backend module using the standard json lib to load and dump JSON data.
Format to support: JSON, http://www.json.org
Requirements: json in python standard library
Development Status :: 5 - Production/Stable
Limitations: None obvious
Special options:
All options of json.load{s,} and json.dump{s,} except object_hook should work.
See also: https://docs.python.org/3/library/json.html or https://docs.python.org/2/library/json.html
Changelog:
Changed in version 0.9.8:
Moved from ..json.py
Drop simplejson support from this module
Changed in version 0.9.6:
Add support of loading primitives other than mapping objects.
Added in version 0.0.1.
- class anyconfig.backend.json.stdlib.Parser¶
Bases:
Parser
Parser for JSON files.
- _cid: typing.ClassVar[str] = 'json.stdlib'¶
- _priority: typing.ClassVar[int] = 30¶
- _load_from_string_fn(*, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw)¶
Deserialize
s
(astr
,bytes
orbytearray
instance containing a JSON document) to a Python object.object_hook
is an optional function that will be called with the result of any object literal decode (adict
). The return value ofobject_hook
will be used instead of thedict
. This feature can be used to implement custom decoders (e.g. JSON-RPC class hinting).object_pairs_hook
is an optional function that will be called with the result of any object literal decoded with an ordered list of pairs. The return value ofobject_pairs_hook
will be used instead of thedict
. This feature can be used to implement custom decoders. Ifobject_hook
is also defined, theobject_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.To use a custom
JSONDecoder
subclass, specify it with thecls
kwarg; otherwiseJSONDecoder
is used.
- _load_from_stream_fn(*, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw)¶
Deserialize
fp
(a.read()
-supporting file-like object containing a JSON document) to a Python object.object_hook
is an optional function that will be called with the result of any object literal decode (adict
). The return value ofobject_hook
will be used instead of thedict
. This feature can be used to implement custom decoders (e.g. JSON-RPC class hinting).object_pairs_hook
is an optional function that will be called with the result of any object literal decoded with an ordered list of pairs. The return value ofobject_pairs_hook
will be used instead of thedict
. This feature can be used to implement custom decoders. Ifobject_hook
is also defined, theobject_pairs_hook
takes priority.To use a custom
JSONDecoder
subclass, specify it with thecls
kwarg; otherwiseJSONDecoder
is used.
- _dump_to_string_fn(*, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw)¶
Serialize
obj
to a JSON formattedstr
.If
skipkeys
is true thendict
keys that are not basic types (str
,int
,float
,bool
,None
) will be skipped instead of raising aTypeError
.If
ensure_ascii
is false, then the return value can contain non-ASCII characters if they appear in strings contained inobj
. Otherwise, all such characters are escaped in JSON strings.If
check_circular
is false, then the circular reference check for container types will be skipped and a circular reference will result in anRecursionError
(or worse).If
allow_nan
is false, then it will be aValueError
to serialize out of rangefloat
values (nan
,inf
,-inf
) in strict compliance of the JSON specification, instead of using the JavaScript equivalents (NaN
,Infinity
,-Infinity
).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 isNone
and(',', ': ')
otherwise. To get the most compact JSON representation, you should specify(',', ':')
to eliminate whitespace.default(obj)
is a function that should return a serializable version of obj or raise TypeError. The default simply raises TypeError.If sort_keys is true (default:
False
), then the output of dictionaries will be sorted by key.To use a custom
JSONEncoder
subclass (e.g. one that overrides the.default()
method to serialize additional types), specify it with thecls
kwarg; otherwiseJSONEncoder
is used.
- _dump_to_stream_fn(fp, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw)¶
Serialize
obj
as a JSON formatted stream tofp
(a.write()
-supporting file-like object).If
skipkeys
is true thendict
keys that are not basic types (str
,int
,float
,bool
,None
) will be skipped instead of raising aTypeError
.If
ensure_ascii
is false, then the strings written tofp
can contain non-ASCII characters if they appear in strings contained inobj
. Otherwise, all such characters are escaped in JSON strings.If
check_circular
is false, then the circular reference check for container types will be skipped and a circular reference will result in anRecursionError
(or worse).If
allow_nan
is false, then it will be aValueError
to serialize out of rangefloat
values (nan
,inf
,-inf
) in strict compliance of the JSON specification, instead of using the JavaScript equivalents (NaN
,Infinity
,-Infinity
).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 isNone
and(',', ': ')
otherwise. To get the most compact JSON representation, you should specify(',', ':')
to eliminate whitespace.default(obj)
is a function that should return a serializable version of obj or raise TypeError. The default simply raises TypeError.If sort_keys is true (default:
False
), then the output of dictionaries will be sorted by key.To use a custom
JSONEncoder
subclass (e.g. one that overrides the.default()
method to serialize additional types), specify it with thecls
kwarg; otherwiseJSONEncoder
is used.
- __annotations__ = {'_allow_primitives': 'typing.ClassVar[bool]', '_cid': 'typing.ClassVar[str]', '_dict_opts': 'tuple[str, ...]', '_dump_opts': 'tuple[str, ...]', '_dump_to_stream_fn': 'typing.Optional[DumpFnT]', '_dump_to_string_fn': 'typing.Optional[DumpFnT]', '_extensions': 'tuple[str, ...]', '_load_from_stream_fn': 'typing.Optional[LoadFnT]', '_load_from_string_fn': 'typing.Optional[LoadFnT]', '_load_opts': 'tuple[str, ...]', '_open_read_mode': 'typing.ClassVar[str]', '_open_write_mode': 'typing.ClassVar[str]', '_ordered': 'typing.ClassVar[bool]', '_priority': 'typing.ClassVar[int]', '_type': 'typing.ClassVar[str]'}¶
- __module__ = 'anyconfig.backend.json.stdlib'¶