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code
import requests
import os
import re
pn = 0 #从哪个图片下标起头 
rn = 30 #每次几多张图片 pn与rn参数是在Google开辟者工具里面找到的两个参数。。。很难找，坑爹啊啊啊
global number
#中文的话文件夹名字会乱码
name = "chaojimali"
def getImagePath(pn = 0):
    try:
        url = '''http://image.baidu.com/search/index?tn=baiduimage&ps=1&ct=201326592&lm=-1&cl=2&nc=1&ie=utf-8&word=%s&pn=%d&rn=%d''' % (name,pn,rn)
        headers = {"user_agent": "Mozilla/5.0"}
        response = requests.get(url, headers=headers)
        # source = BeautifulSoup(response.content, 'lxml', from_encoding='utf-8')
        # paths = source.find_all("objURL")
        content = response.content
        #正则考证
        # links = re.findall('"((http|ftp)s?://.*?.(png|jpg|jpeg|gif))"', response.content)
        links = re.findall('"((http|ftp)s?://.*?.(png|jpg|jpeg|gif))"',content)
        if not os.path.exists(name):
            os.mkdir(name)
        for path in links:
            imgPath = path[0]
            image = requests.get(imgPath)
            #返回码为200才去下载
            if image.status_code != 200:
                continue
            print imgPath
            try:
                #尝试下载图片，失利了跳过这张图
                open(name + os.sep + (imgPath[imgPath.rfind("/"):]), "wb").write(image.content)
            except:
                continue
        pn+=rn
        getImagePath(pn)
    except:
        pn += rn
        getImagePath(pn)
#起头
getImagePath(pn)