我正在抓取一些具有复杂分层信息的数据,需要将结果导出到 json。
我将项目定义为
class FamilyItem():
name = Field()
sons = Field()
class SonsItem():
name = Field()
grandsons = Field()
class GrandsonsItem():
name = Field()
age = Field()
weight = Field()
sex = Field()
当蜘蛛运行完成时,我会得到一个打印的项目输出,如
{'name': 'Jenny',
'sons': [
{'name': u'S1',
'grandsons': [
{'name': u'GS1',
'age': 18,
'weight': 50
},
{
'name':u'GS2',
'age': 19,
'weight':51}]
}]
}
但是当我运行 scrapy crawl myscaper -o a.json
时,它总是说结果“不是 JSON 可序列化的”。然后我将项目输出复制并粘贴到 ipython 控制台并使用 json.dumps(),它工作正常。那么问题出在哪里?这让我发疯了......
最佳答案
保存嵌套项时,请确保将它们包装在对 dict() 的调用中,例如:
gs1 = GrandsonsItem()
gs1['name'] = 'GS1'
gs1['age'] = 18
gs1['weight'] = 50
gs2 = GrandsonsItem()
gs2['name'] = 'GS2'
gs2['age'] = 19
gs2['weight'] = 51
s1 = SonsItem()
s1['name'] = 'S1'
s1['grandsons'] = [dict(gs1), dict(gs2)]
jenny = FamilyItem()
jenny['name'] = 'Jenny'
jenny['sons'] = [dict(s1)]
https://stackoverflow.com/questions/11184557/