标签：return 3.5 #### color dict name hal ali first
schema.dump()方法返回一个MarshResult的对象，marshmallow官方API说dump和load方法返回的都是dict对象，但查看源码，MarshResult对象是一个namedtuple.
## marshmallow::schema.py
### line 25 ####
#: Return type of :meth:`Schema.dump` including serialized data and errors MarshalResult = namedtuple(‘MarshalResult‘, [‘data‘, ‘errors‘]) #: Return type of :meth:`Schema.load`, including deserialized data and errors UnmarshalResult = namedtuple(‘UnmarshalResult‘, [‘data‘, ‘errors‘])
我在跑官方Example的时候，这里是有问题的
try: data = quote_schema.load(json_data) except ValidationError as err: return jsonify(err.messages), 422 first, last = data[‘author‘][‘first‘], data[‘author‘][‘last‘] # 此处代码报错， TypeError: tuple indices must be integers or slices, not str
namedtuple通过result[‘data‘][‘xxx‘]的方法无法访问对象信息
但是通过result.data[‘xxx‘]却是OK的。Python Doc里对namedtuple的问方式也是"."访问。好像可以理解为name是namedtuple的一个attribute，
>>> # Basic example >>> Point = namedtuple(‘Point‘, [‘x‘, ‘y‘]) >>> p = Point(11, y=22) # instantiate with positional or keyword arguments >>> x, y = p # unpack like a regular tuple >>> x, y (11, 22) >>> p.x + p.y # fields also accessible by name 33 >>> p # readable __repr__ with a name=value style Point(x=11, y=22)
标签：return 3.5 #### color dict name hal ali first
原文地址：https://www.cnblogs.com/oDoraemon/p/9249856.html
