Bag Class (only need to implement the class)- Python

This is the spec : [login to view URL] [login to view URL] [login to view URL] Just one small program. You only have to implement the class. Template is already given. As simple as that. Below is a similar Bag class program I did before in Java: [login to view URL] Please do it as soon as possible. I need it within 20 hours. I can't think of high bidding $ on this, because it is THAT simple.