原文：github

import urllib.request, urllib.parse, os, urllib, http.cookiejar, re

# 下载极客学院的视频
# 需要一个vip账号(验证邮箱和手机会有体验vip)
class DownCourse(object):
    # 给urllib添加cookie支持
    # path: 下载的视频要保存的文件夹
    def __init__(self,path):
        # 初始化一个CookieJar来处理Cookie
        cookieJar = http.cookiejar.CookieJar()
        # 实例化一个全局opener
        opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cookieJar))
        # 把这个cookie处理机制装上去,大概是这个意思-.-
        urllib.request.install_opener(opener)

        self.folderPath = path
        # 判断文件夹是否存在
        folderExists = os.path.exists(self.folderPath)
        if not folderExists:
            os.mkdir(self.folderPath)

    # 登陆函数
    def login(self):
        # 从登录页面获取登陆参数
        login_url = 'http://passport.jikexueyuan.com/sso/login'
        # 登陆信息发送到这个地址
        passport_url = 'http://passport.jikexueyuan.com/submit/login?is_ajax=1'
        verifyCode_url = 'http://passport.jikexueyuan.com/sso/verify'

        # 获取登陆页面源码
        request = urllib.request.urlopen(login_url)
        html = request.read()
        request.close()

        # 获取登陆要post的数据
        expire = re.search(r"(?s)value='(.*?)' name='expire",html)
        # 验证码
        verifyCodeGifPath = '/tmp/jikexueyuan.gif'
        request = urllib.request.urlopen(verifyCode_url)
        gif = request.read()
        request.close()
        fGif = open(verifyCodeGifPath,'w')
        fGif.write(gif)
        fGif.close()
        # 读取保存到本地的验证码图片
        os.system('eog ' + verifyCodeGifPath)
        verify = input("请输入图中的验证码:")

        data = {
            'expire': expire.group(1),
            'referer': 'http%3A%2F%2Fwww.jikexueyuan.com%2F',
            'uname': XXX,
            'password': XXX,
            'verify': verify,
        }
        post_data = urllib.parse.urlencode(data)

        request = urllib.request.Request(passport_url,post_data)
        # 给一个useragent,防止被认为是爬虫程序
        request.add_header('User-Agent', 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.125 Safari/537.36')
        # 发送登录请求
        request = urllib.request.urlopen(request)
        request.close()
        print('登陆完成')

    # courseUrl: 课程地址首页,例如:http://www.jikexueyuan.com/course/989.html
    def download(self, courseUrl):
        # 获取课程名称
        request = urllib.request.urlopen(courseUrl)
        coursePageHtml = request.read()
        request.close()
        courseName = re.search(r'(?s)<title>(.*?)-',coursePageHtml).group(1)
        # 课程数量
        courseCount = int(re.search(r'(?s)class="timebox"><span>(.*?)课时',coursePageHtml).group(1))
        # 存储视频的文件夹路径
        folderPath = self.folderPath + courseName + '/'
        # 判断文件夹是否存在
        folderExists = os.path.exists(folderPath)
        if not folderExists:
            os.mkdir(folderPath)

        print('课程名:' + courseName + ' 课程数量:' + str(courseCount))
        # 课程的编号,构建课程的页面地址
        i = 0
        while i < courseCount:
            i += 1
            pageUrl = courseUrl.split('.html')[0] + '_' + str(i) + '.html?ss=1'
            # 本节课程的html代码
            request = urllib.request.urlopen(pageUrl)
            pageHtml = request.read()
            request.close()
            # 本节课程的名称
            name = re.search(r'(?s)<title>(.*?)-',pageHtml).group(1)
            # 本节课程的视频地址
            videoUrl = re.search(r'<source src="(.*?)"',pageHtml)
            # 有的页面写的课时比实际课时多,会匹配不到视频地址
            if videoUrl == None:
                continue
            else:
                videoUrl = videoUrl.group(1)
            print('正在下载' + name + '...')
            # 存储视频的Path: 总路径/课程名/每一节的名称
            urllib.urlretrieve(videoUrl,folderPath + str(i) + name + '.mp4',self.cbk)
        print('下载完成')

    # 从网上下载的可以显示下载进度的函数
    # \\b是我加的,产生了很奇特的显示效果,还行
    def cbk(self,a, b, c):
        per = 100.0*a*b/c
        if per > 100:
            per = 100
        print('%.2f%%\\b\\b\\b\\b\\b\\b' % per)

    def cbk(self,a,b,c):
        per = 100.0 * a * b /c
        if per >100:
            per = 100
        print('%.2f%%\\b\\b\\b\\b\\b\\b' % per)

# 建立下载对象,参数是即将下载的这些视频放的目录,程序会根据课程名在这个文件夹里面再建文件夹
down = DownCourse('/home/geekgao/视频/SpringMVC/')
down.login()

# 下载一个页面中的所有课程
request = urllib.request.urlopen('http://www.jikexueyuan.com/course/springmvc/')
html = request.read()
request.close()
courseUrls = re.findall(r'class="lesson-info-h2"><a href="(.*?)"',html)

for courseUrl in courseUrls:
    down.download(courseUrl)