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[3.13] Docs: mark up json.dump() using parameter list (GH-128482) (#128486)
(cherry picked from commit a0088b40bb
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Co-authored-by: Erlend E. Aasland <erlend@python.org>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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@ -151,63 +151,12 @@ Basic Usage
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sort_keys=False, **kw)
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Serialize *obj* as a JSON formatted stream to *fp* (a ``.write()``-supporting
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:term:`file-like object`) using this :ref:`conversion table
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:term:`file-like object`) using this :ref:`Python-to-JSON conversion table
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<py-to-json-table>`.
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If *skipkeys* is true (default: ``False``), then dict keys that are not
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of a basic type (:class:`str`, :class:`int`, :class:`float`, :class:`bool`,
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``None``) will be skipped instead of raising a :exc:`TypeError`.
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The :mod:`json` module always produces :class:`str` objects, not
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:class:`bytes` objects. Therefore, ``fp.write()`` must support :class:`str`
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input.
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If *ensure_ascii* is true (the default), the output is guaranteed to
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have all incoming non-ASCII characters escaped. If *ensure_ascii* is
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false, these characters will be output as-is.
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If *check_circular* is false (default: ``True``), then the circular
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reference check for container types will be skipped and a circular reference
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will result in a :exc:`RecursionError` (or worse).
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If *allow_nan* is false (default: ``True``), then it will be a
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:exc:`ValueError` to serialize out of range :class:`float` values (``nan``,
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``inf``, ``-inf``) in strict compliance of the JSON specification.
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If *allow_nan* is true, their JavaScript equivalents (``NaN``,
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``Infinity``, ``-Infinity``) will be used.
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If *indent* is a non-negative integer or string, then JSON array elements and
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object members will be pretty-printed with that indent level. An indent level
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of 0, negative, or ``""`` will only insert newlines. ``None`` (the default)
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selects the most compact representation. Using a positive integer indent
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indents that many spaces per level. If *indent* is a string (such as ``"\t"``),
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that string is used to indent each level.
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.. versionchanged:: 3.2
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Allow strings for *indent* in addition to integers.
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If specified, *separators* should be an ``(item_separator, key_separator)``
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tuple. The default is ``(', ', ': ')`` if *indent* is ``None`` and
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``(',', ': ')`` otherwise. To get the most compact JSON representation,
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you should specify ``(',', ':')`` to eliminate whitespace.
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.. versionchanged:: 3.4
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Use ``(',', ': ')`` as default if *indent* is not ``None``.
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If specified, *default* should be a function that gets called for objects that
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can't otherwise be serialized. It should return a JSON encodable version of
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the object or raise a :exc:`TypeError`. If not specified, :exc:`TypeError`
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is raised.
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If *sort_keys* is true (default: ``False``), then the output of
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dictionaries will be sorted by key.
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To use a custom :class:`JSONEncoder` subclass (e.g. one that overrides the
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To use a custom :class:`JSONEncoder` subclass (for example, one that overrides the
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:meth:`~JSONEncoder.default` method to serialize additional types), specify it with the
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*cls* kwarg; otherwise :class:`JSONEncoder` is used.
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.. versionchanged:: 3.6
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All optional parameters are now :ref:`keyword-only <keyword-only_parameter>`.
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*cls* keyword argument; otherwise :class:`JSONEncoder` is used.
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.. note::
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@ -215,6 +164,79 @@ Basic Usage
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so trying to serialize multiple objects with repeated calls to
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:func:`dump` using the same *fp* will result in an invalid JSON file.
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:param object obj:
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The Python object to be serialized.
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:param fp:
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The file-like object *obj* will be serialized to.
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The :mod:`!json` module always produces :class:`str` objects,
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not :class:`bytes` objects,
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therefore ``fp.write()`` must support :class:`str` input.
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:type fp: :term:`file-like object`
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:param bool skipkeys:
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If ``True``, keys that are not of a basic type
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(:class:`str`, :class:`int`, :class:`float`, :class:`bool`, ``None``)
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will be skipped instead of raising a :exc:`TypeError`.
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Default ``False``.
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:param bool ensure_ascii:
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If ``True`` (the default), the output is guaranteed to
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have all incoming non-ASCII characters escaped.
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If ``False``, these characters will be outputted as-is.
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:param bool check_circular:
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If ``False``, the circular reference check for container types is skipped
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and a circular reference will result in a :exc:`RecursionError` (or worse).
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Default ``True``.
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:param bool allow_nan:
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If ``False``, serialization of out-of-range :class:`float` values
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(``nan``, ``inf``, ``-inf``) will result in a :exc:`ValueError`,
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in strict compliance with the JSON specification.
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If ``True`` (the default), their JavaScript equivalents
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(``NaN``, ``Infinity``, ``-Infinity``) are used.
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:param indent:
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If a positive integer or string, JSON array elements and
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object members will be pretty-printed with that indent level.
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A positive integer indents that many spaces per level;
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a string (such as ``"\t"``) is used to indent each level.
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If zero, negative, or ``""`` (the empty string),
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only newlines are inserted.
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If ``None`` (the default), the most compact representation is used.
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:type indent: int | str | None
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:param separators:
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A two-tuple: ``(item_separator, key_separator)``.
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If ``None`` (the default), *separators* defaults to
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``(', ', ': ')`` if *indent* is ``None``,
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and ``(',', ': ')`` otherwise.
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For the most compact JSON,
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specify ``(',', ':')`` to eliminate whitespace.
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:type separators: tuple | None
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:param default:
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A function that is called for objects that can't otherwise be serialized.
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It should return a JSON encodable version of the object
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or raise a :exc:`TypeError`.
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If ``None`` (the default), :exc:`!TypeError` is raised.
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:type default: :term:`callable` | None
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:param sort_keys:
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If ``True``, dictionaries will be outputted sorted by key.
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Default ``False``.
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.. versionchanged:: 3.2
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Allow strings for *indent* in addition to integers.
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.. versionchanged:: 3.4
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Use ``(',', ': ')`` as default if *indent* is not ``None``.
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.. versionchanged:: 3.6
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All optional parameters are now :ref:`keyword-only <keyword-only_parameter>`.
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.. function:: dumps(obj, *, skipkeys=False, ensure_ascii=True, \
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check_circular=True, allow_nan=True, cls=None, \
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indent=None, separators=None, default=None, \
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