json.dumps() 对datetime.datetime, datetime.date类型数据无法识别会报错, 需要自定义encoder 来解决
在学习flask的源码中,了解了偏函数 ,可以创建原函数的代理,支持预设参数,还可保留原来该用方式
代码如下:
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from functools import partial
class DateEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, datetime.datetime):
return obj.strftime('%Y-%m-%d %H:%M:%S')
elif isinstance(obj, datetime.date):
return obj.strftime("%Y-%m-%d")
else:
return json.JSONEncoder.default(self, obj)
json_dump=partial(json.dumps, ensure_ascii=False, cls=DateEncoder)
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调用:
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import copy
class User(object):
def __init__(self, id, sname):
self.id=id
self.sname=sname
self.time=datetime.datetime.now()
self.sname_zh='汉字'
def __repr__(self):
self_dict = copy.deepcopy(self.__dict__)
return json_dump(self_dict, indent=2 )
print User(1, 'admin')
>>> {
"time": "2019-08-13 14:04:21",
"sname": "admin",
"id": 1,
"sname_zh": "汉字"
}
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