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Update class_start.py #18

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18 changes: 13 additions & 5 deletions Start/Ch 1/class_start.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,26 +4,34 @@

class Book:
# TODO: Properties defined at the class level are shared by all instances
BOOK_TYPES= ("HARDCOVER", "PAPERBACK", "EBOOK")

# TODO: double-underscore properties are hidden from other classes

# TODO: create a class method

@classmethod
def get_book_types(cls):
return cls.BOOK_TYPES
# TODO: create a static method

# instance methods receive a specific object instance as an argument
# and operate on data specific to that object instance
def set_title(self, newtitle):
self.title = newtitle
if(not booktype in Book.BOOK_TYPES):
raise ValueError(f"{booktype} is not a valid book type")
else:
self.booktype= booktype


def __init__(self, title):
def __init__(self, title, booktype):
self.title = title


# TODO: access the class attribute

print("Book types: ", Book.get_book_types())

# TODO: Create some book instances


b1= Book("Title1", "HARDCOVER")
b2= Book("Title1", "COMIC")
# TODO: Use the static method to access a singleton object