what is file?

virtual unit offered by operation system

steps to open file

1.find the file_path(file_path)

2.open file(open)

3.read or change the file(read/write)

4.save the files(flush)

5.close the file (close)

w：clear the file and write in

r：can only read

a:write in after the file

b：binary

t：text

you'd better not to use three ways below

1.r+

2.a+

3.w+

f=open()

f.read()

#close file automaticly

with open() as f

     f.read()

send requests through explore to get files，through requests module analog browser gets content

1.send requests（filling url）

2.get context

3.choose the value you need

import requests

res=requests.get(url)

#wenben

res.txt

#erjinzhiliu

res.content

re.S search all

re.findall() choose what you need in the context

if you need anything just(.*?)