python爬虫：无视https的CA安全认证
import urllib.request
import ssl
context = ssl._create_unverified_context()
url = 'https://www.12306.cn/mormhweb/'
request = urllib.request.Request(url)
response = urllib.request.urlopen(url = request, context=context)
print (response.read().decode('utf-8'))
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