Python字典的json格式化处理（换⾏与不换⾏）
Python使⽤ json.dumps(json_dict, indent=1)中的indent参数指定json字典换⾏缩进。类似的还可以使⽤json.dump(json_dict, fp,
indent=1)
Prefer ={"jim": {"War": 1.9, "the big bang": 1.0, "The lord of wings": 4.0, "Beautiful America": 4.7}, "lily": {"War": 2.0, "Kongfu": 4.1, "The
lord of wings": 3.6}, "tommy": {"War": 2.3, "Kongfu": 5.0, "The lord of wings": 3.0}, "jack": {"War": 2.8, "Kongfu": 5.5, "The lord of
wings": 3.5}}
print('将字典⼀⾏显⽰不换⾏')
print(json.dumps(Prefer))
print('将字典按照json样式可视化显⽰')
print(json.dumps(Prefer,indent=1))
显⽰的结果是：
将字典⼀⾏显⽰不换⾏
{"jim": {"War": 1.9, "the big bang": 1.0, "The lord of wings": 4.0, "Beautiful America": 4.7}, "lily": {"War": 2.0, "Kongfu": 4.1, "The lord of wings": 3.6}, "tommy": {"War 将字典按照json样式可视化显⽰
{
"jim": {
"War": 1.9,
"the big bang": 1.0,
"The lord of wings": 4.0,
"Beautiful America": 4.7
},
"lily": {
"War": 2.0,
"Kongfu": 4.1,
"The lord of wings": 3.6
},
"tommy": {
"War": 2.3,
"Kongfu": 5.0,
"The lord of wings": 3.0
},
"jack": {
"War": 2.8,
"Kongfu": 5.5,
"The lord of wings": 3.5
}
}
函数定义：
def dump(obj, 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 to ``fp`` (a
``.write()``-supporting file-like object).
If ``skipkeys`` is true then ``dict`` keys that are not basic types
(``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped
instead of raising a ``TypeError``.
If ``ensure_ascii`` is false, then the strings written to ``fp`` can
contain non-ASCII characters if they appear in strings contained in
``obj``. 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 an ``OverflowError`` (or worse).
If ``allow_nan`` is false, then it will be a ``ValueError`` to
serialize out of range ``float`` 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
浏览器json格式化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.
``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
the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.
"""

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