十四. 下载图片的两种方法

1.下载图片的两种方法：
1). urllib.request.urlretrieve 方法：方法简单，直接对获取到的图片链接进行下载。
urlretrieve(url,path)

2). requests写入方法：对图片链接进行请求，文件写入时采用‘wb’方式，写入数据为r.content。

r = requests.get(url)
with open(filename, 'wb') as f:     
    f.write(r.content)

2.实例：百度贴吧图片，共67张图片。

#方法一
import re
import urllib.request

url = "http://tieba.baidu.com/p/2460150866"
response = urllib.request.urlopen(url).read().decode('UTF-8')
##response = urllib.request.urlopen(url).read().decode()        #等价于上一句，默认用UTF-8来解码

imglist = re.findall('src="(.+?\.jpg)" pic_ext',response)

x = 0
for imgurl in imglist:
    urllib.request.urlretrieve(imgurl,"F:/{}.jpg".format(x))    #远程下载图片
    x +=1
    print("第",x,"张")
print("Finshed!")

#方法二
import re
import requests

url = "http://tieba.baidu.com/p/2460150866"
r = requests.get(url)

imglist = re.findall('src="(.+?\.jpg)" pic_ext',r.text)

x = 0
for imgurl in imglist:
    imgres = requests.get(imgurl)
    with open("F:/{}.jpg".format(x),"wb") as f:                 ##保存图片
        f.write(imgres.content)
        x +=1
        print("第",x,"张") 
print("Finshed!")