将datetime.datetime对象序列化为JSON [英] Serialize datetime.datetime object as JSON

问题描述

当前正在使用python进行一个快速的小项目，并正在尝试将一个对象编码为JSON字符串.我已经做过几次了，除了现在没有任何问题.通常，我只执行以下操作.

Currently working on a quick little project in python and am attempting to encode an object into a JSON string. I've done this several times before without any problem except for now. Usually I just do the following.

def ClassToEncode :
    def __init__(self, arg1, arg2, ..., argn) :
        self.attr1 = arg1
        self.attr2 = arg2
        ...
        self.attrn = argn

     ...
     def toJSON(self) :
         return json.dumps(self, default=lambda o: o.__dict__)

但是问题是我的类属性之一是datetime.datetime对象，我被抛出以下错误

But the problem is that one of my class attributes is a datetime.datetime object and I am being thrown the following error

AttributeError: 'datetime.datetime' object has no attribute '__dict__'

任何想法或解决方案都可以启用将datetime属性包含到JSON输出中的功能?

Any thoughts or wraparounds that could enable the functionality of including the datetime attribute into the JSON output??

提前谢谢！

推荐答案

您可以使用 isoformat() 方法转换为ISO-8601格式的时间字符串，然后将其序列化为JSON就可以了.在另一端，在计算机上调用 datetime.datetime.strptime() 格式化的字符串，将其转换回datetime对象:

>>> from datetime import datetime as dt
>>> now = dt.now()
>>> now
datetime.datetime(2014, 9, 4, 3, 19, 44, 214096)
>>> isonow = now.isoformat()
>>> isonow
'2014-09-04T03:19:44.214096'
>>> format = "%Y-%m-%dT%H:%M:%S.%f"
>>> newtime = dt.strptime(isonow, format)
>>> newtime
datetime.datetime(2014, 9, 4, 3, 19, 44, 214096)

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