def lessonkeys(self):
    classin_re = re.compile('(?<=https:\\/\\/www\\.eeo\\.cn\\/live\\.php\\?lessonKey\\=)[0-9a-zA-Z]+')
    keys = classin_re.findall(self.html)
    return keys
def lessonkeys(self):
    classin_re = re.compile('(?<=https:\\/\\/www\\.eeo\\.cn\\/live\\.php\\?lessonKey\\=)[0-9a-zA-Z]+')
    keys = classin_re.findall(self.html)
    return keys