04urllib解决分页问题

以下代码解决的是分页读取写入数据

from urllib import request,parse
import os
"""
1.分页问题
2.文件操作（检测，建立，写入）
"""
def keyword(kw):
print(type(kw))
start = input('请输入开始页：')
end = input('请输入结束页：')
kw1 = {
'kw': kw
}
qs = parse.urlencode(kw1)
for i in range(int(start),int(end)+1):
pn = (i-1)*50
base_url = 'https://tieba.baidu.com/f?' + qs + '&pn='+str(pn)
print(base_url)
req = request.urlopen(base_url)
html = req.read()
if not os.path.exists(kw):
os.mkdir("04"+kw)
with open(kw+'/'+str(i)+'.html','w',encoding='utf-8') as f:
f.write(html.decode('utf-8'))
print(html.decode('utf-8'))

if __name__=='__main__':
keyword(input('请输入：'))