scrapy爬取招聘网站，items转换成dict遇到的问题

pipelines代码

import json

class TencentJsonPipeline(object):
    def __init__(self):
        self.file = open('tencent.json','wb')

    def process_item(self, item, spider):
        content = json.dumps(dict(item),ensure_ascii=False)+"\n"
        self.file.write(content)
        return item
    def close_project(self):
        self.file.close()

报错：

    self.file.write(content)
TypeError: a bytes-like object is required, not 'str'

这个问题是基本的编码解码问题，打开json文件时不能用‘wb’，而是‘w’，编码方式为utf-8

更正后代码：

class TencentJsonPipeline(object):
    def __init__(self):
        self.file = open('tencent.json','w',encoding='utf-8')

    def process_item(self, item, spider):
        content = json.dumps(dict(item),ensure_ascii=False)+"\n"
        self.file.write(content)
        return item
    def close_project(self):
        self.file.close()

运行正常

参考地址：https://stackoverflow.com/questions/44682018/typeerror-object-of-type-bytes-is-not-json-serializable