Python/Scrapy转到其他URL

import scrapy
from scrapy.http import Request

class MySpider(scrapy.Spider):
    name = 'my_spider'
    start_urls = ['http://example.com']

def start_requests(self):
    for url in self.start_urls:
        yield Request(url, callback=self.parse)

def parse(self, response):
    # 在这里编写提取数据的代码
    pass

def parse(self, response):
    data = response.xpath('//div[@class="example"]/text()').get()
    yield {'data': data}

def parse(self, response):
    data = response.xpath('//div[@class="example"]/text()').get()
    yield {'data': data}

    # 发送新的请求
    yield Request('http://example.com/other_page', callback=self.parse_other_page)

def parse_other_page(self, response):
    # 在这里编写提取数据的代码
    pass