TypeError:write() argument must be str, not bytes

class ItcastPipeline(object):
def init(self):
self.f = open(“itcast_pipelines.json”,“w”)

def process_item(self, item, spider):
    content = json.dumps(dict(item), ensure_ascii=False) + ", \n"
    self.f.write(content.encode("utf-8"))
    return item
    #返回给引擎

def close_spider(self,spider):
    self.f.close()

将文件打开方式改为wb二进制方式打开，解决问题