Python urllib.request对象案例解析

#coding=utf-8
#import urllib.request
#=========response方法使用
#read()==读取文件内容
#geturl()==获取请求url
#getheaders()==获取http请求头信息
#getcode()==获取状态码
#readlines()==获取一行
#url="http://www.baidu.com";
#response = urllib.request.urlopen(url);
#=====案例1
# str = response.read().decode();#这样通过decode转换为utf8
# with open("baidu.html","w",encoding="utf8") as fp:
#   fp.write(str);
#=====案例2通过字节流写=默认通过read读取的是字节流
# with open("bai.html","wb") as fp:
#   fp.write(response.read()); 
#==使用字节流读取存图片
# image_url='https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3772530225,1800402028&fm=26&gp=0.jpg';
# response = urllib.request.urlopen(image_url);
# with open("mv.jpg",'wb') as fp:
#   fp.write(response.read());
#案例3==使用内置函数读取图片
#image_url='https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3772530225,1800402028&fm=26&gp=0.jpg';
#urllib.request.urlretrieve(image_url,"chun.jpg");