import requests
#引用requests模块
sanguo = requests.get('https://static.pandateacher.com/sanguo.md')
#下载《三国演义》，赋值给sanguo
print(sanguo.content.decode('utf-8'))
booksanguo = open('E:\\booksanguo.txt','w',encoding='utf-8')
booksanguo.write(sanguo.content.decode('utf-8'))
booksanguo.close()

注意：

• get（……）这里……相当于 URL=……，get（URL）,sanguo=requests.get(url)

• print(sanguo)
  output：
  <Response [200]>
  正确的输出是print（sanguo.content.decode('utf-8')），意思是输出sanguo的content（内容），解码用utf-8

×：print（sanguo）

√：print(sanguo.content.decode('utf-8'))