scrapy怎么设置带有密码的代理ip base64.encodestring不能用 python3.5，base64库里面的encodestring()被换成了什么？

自己写爬虫时买的代理ip有密码，在网上查了都是下面这种：

1、在Scrapy工程下新建"middlewares.py":

import base64

# Start your middleware class

class ProxyMiddleware(object):

    # overwrite process request

    def process_request(self, request, spider):

        # Set the location of the proxy

        request.meta['proxy'] = "http://YOUR_PROXY_IP:PORT"

  

        # Use the following lines if your proxy requires authentication

        proxy_user_pass = "USERNAME:PASSWORD"

        # setup basic authentication for the proxy

        encoded_user_pass = base64.encodestring(proxy_user_pass)  #我用的python3.5，这个地方报错 TypeError: expected bytes-like object, not str

        request.headers['Proxy-Authorization'] = 'Basic ' + encoded_user_pass

2、在项目配置文件里setting.py添加:

DOWNLOADER_MIDDLEWARES = {

    ...   #此处省略其他中间件配置

    'ScrapyRedisTest.middlewares.ProxyMiddleware': 100,

}

================================解决方法如下：（只改动标红的两行，其他的都不变）================================================

import base64

# Start your middleware class

class ProxyMiddleware(object):

    # overwrite process request

    def process_request(self, request, spider):

        # Set the location of the proxy

        request.meta['proxy'] = "http://YOUR_PROXY_IP:PORT"

        # Use the following lines if your proxy requires authentication

        proxy_user_pass = "USERNAME:PASSWORD"

        # setup basic authentication for the proxy

        encoded_user_pass = base64.b64encode(proxy_user_pass.encode('utf-8')) 

      request.headers['Proxy-Authorization'] = 'Basic ' + str(encoded_user_pass, encoding="utf-8")

2、在项目配置文件里setting.py添加:

DOWNLOADER_MIDDLEWARES = {

    ...   #此处省略其他中间件配置

    'ScrapyRedisTest.middlewares.ProxyMiddleware': 100,

}