当使用urllib.request.urlopen打开包含中文的链接时报错：
from urllib import request
url = 'https://baike.baidu.com/item/糖尿病'
response = request.urlopen(url)
提示错误：UnicodeEncodeError: ‘ascii’ codec can’t encode characters in position 10-12: ordinal not in range(128)
参考https://www.zhihu.com/question/22899135 和https://blog.csdn.net/sijiaqi11/article/details/78449770 得知，
urllib.request.urlopen不支持中英文混合的字符串。
应使用urllib.parse.quote进行转换。
#coding=utf-8
from urllib import request
from urllib.parse import quote
import string
url = 'https://baike.baidu.com/item/糖尿病'
s = quote(url,safe=string.printable)
response = request.urlopen(s)