在python中将dict转换为json时出错

Question

在python中使用哪个库将其转换为json？

编辑1：我的代码现在看起来像

import boto3
import json
rds_client = boto3.client('rds', 'ap-southeast-1')
db_instance_info = rds_client.describe_db_instances()
with open('result.json', 'w') as db:
    json.dump(db_instance_info, db)

它显示了这个错误

Traceback (most recent call last):
  File "list.py", line 14, in <module>
    json.dump(db_instance_info, db)
  File "/usr/lib/python2.7/json/__init__.py", line 189, in dump
    for chunk in iterable:
  File "/usr/lib/python2.7/json/encoder.py", line 434, in _iterencode
    for chunk in _iterencode_dict(o, _current_indent_level):
  File "/usr/lib/python2.7/json/encoder.py", line 408, in _iterencode_dict
    for chunk in chunks:
  File "/usr/lib/python2.7/json/encoder.py", line 332, in _iterencode_list
    for chunk in chunks:
  File "/usr/lib/python2.7/json/encoder.py", line 408, in _iterencode_dict
    for chunk in chunks:
  File "/usr/lib/python2.7/json/encoder.py", line 442, in _iterencode
    o = _default(o)
  File "/usr/lib/python2.7/json/encoder.py", line 184, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: datetime.datetime(2017, 6, 6, 9, 7, 33, 472000, tzinfo=tzutc()) is not JSON serializable

Answer 1

你可以在python中使用json库

import json
x = {'s': True}
r = json.dumps(x)

这将给出一个json字符串

Answer 2

只需使用json模块：

import json
jsonarray = json.dumps(the_dict, ensure_ascii=False)

确保存在ascii位，以避免任何编码/解码错误。

Answer 3

错误是明确的：

TypeError: datetime.datetime(2017, 6, 6, 9, 7, 33, 472000, tzinfo=tzutc()) is not JSON serializable

默认情况下，json模块不能序列化任何来自datetime模块的类型，并且您的字典包含...，u'InstanceCreateTime'：datetime.datetime（2017, 6, 6, 9, 7, 33, 472000，tzinfo=tzutc（）），并且稍后的其他日期。

惯用的方法是定义一个自定义编码器来处理相关对象。覆盖默认方法、处理特定对象并将所有其他内容传递给基类方法就足够了：

class DateEncoder(json.JSONEncoder):
"""This encoder only use the default string convertion for the types
date, time and datetime of the datetime module"""
    def default(self, o):
        if (isinstance(o, datetime.date)
            or isinstance(o, datetime.datetime)
            or isinstance(o, datetime.time)):
            return str(o)                # specialize here the format...
        return json.JSONEncoder.default(self, o)

然后，您可以使用它构建json：

with open('result.json', 'w') as db:
    json.dump(db_instance_info, db, cls=DateEncoder)