python json模块默认不能序列化decimal和datetime数据，可以通过自定义一个序列化的类实现：
link: http://www.cnblogs.com/buxizhizhoum/p/7607036.html
import json
import datetime
class SupplementaryEncoder(json.JSONEncoder): ???def default(self, obj): ???????if isinstance(obj, decimal.Decimal): ?# for decimal ???????????return float(obj) ???????elif isinstance(obj, datetime.datetime): ?# for datetime ???????????return obj.strftime("%Y-%m-%d %H:%M:%S") ???????return json.JSONEncoder.default(self, obj)
test_dict = {"a": datetime.datetime.now()}
res = json.dumps(test_dict, cls=SupplementaryEncoder)
json decimal and datetime
原文地址：http://www.cnblogs.com/buxizhizhoum/p/7607036.html