http://www.w3cschool.cc/mongodb/mongodb-linux-install.html
http://api.mongodb.org/python/current/examples/gridfs.html
http://www.w3cschool.cc/mongodb/mongodb-linux-install.html
http://api.mongodb.org/python/current/examples/gridfs.html
class MetaCls(type): def __new__(cls, *args, **kwargs): print("in MetaCls") # return super(Meta