Python爬取圖片2

import requests
def geturl(url):
    kv = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
    }
    r=requests.get(url,headers=kv)
    return  r.content
def save(text,num):
    cat_img=text
    with open('cat_500'+num+'.jpg','wb')as f:
        f.write(cat_img)
if __name__ == '__main__':
    num=input("輸入圖片尺寸：")
    url = 'http://placekitten.com/g/500/'+num
    text=geturl(url)
    save(text, num)