handler的创建

import urllib.request

# 1、创建handler对象
handler = urllib.request.HTTPHandler()
# 2、根据handler对象创建opener对象
opener = urllib.request.build_opener(handler)

# 3、再往下走，发送请求的时候使用opener.open()方法发送即可
url = 'http://www.baidu.com/'
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36',
}
request = urllib.request.Request(url=url, headers=headers)

response = opener.open(request)

with open('baidu.html', 'wb') as fp:
    fp.write(response.read())

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