編寫python指令碼，除錯的時候需要列印json格式報文，直接列印看不出層次，可以使用json.dumps格式化列印

import json
import requests

def test_json():
  r=requests.get('https://home.testing-studio.com/categories.json')
  print(r.json())
  print(json.dumps(r.json(),indent=2,ensure_ascii=False)) # r.json()是json物件，indent表示縮排，ensure_ascii設定編碼
格式化列印前：

格式化列印前：

格式化列印後：

json.dumps方法原始碼：

def dumps(obj,*,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 formatted ``str``.

  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 return value 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
  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.

  """
  # cached encoder
  if (not skipkeys and ensure_ascii and
    check_circular and allow_nan and
    cls is None and indent is None and separators is None and
    default is None and not sort_keys and not kw):
    return _default_encoder.encode(obj)
  if cls is None:
    cls = JSONEncoder
  return cls(
    skipkeys=skipkeys,ensure_ascii=ensure_ascii,check_circular=check_circular,allow_nan=allow_nan,indent=indent,separators=separators,default=default,sort_keys=sort_keys,**kw).encode(obj)

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