In Python, Whats wrong with the following class definition? (HINT: There are 5 bugs)

Assuming its bugs were fixed, can you explain what this class is trying to do? What is the purpose of each class method (including the constructor)?

class Bookcase: def init (self): shelves-[ return def addShelf (self): shelves.append return def addBook (self, shelf, book): if shelf >- 0 and shelf