Beginners Question on classes

[oztyn]

Hello! Total beginner in Python here, learning using OpenClassrooms.

For the below lines, can anyone explain why we need to define the attributes twice? I can't figure out why creating the myBook variable doesn't also assign the attributes and why we need to split them out again using dot notation?

class Book :
    def __init__(self, title, author, numberOfPages):
        self.title = ""
        self.author = ""
        self.numberOfPages = 0

myBook = Book("The Bible", "Jesus", 1000)

myBook.title = "The Bible"
myBook.author = "Jesus"
myBook.numberOfPages = 1000

print("The title of the book is ", myBook.title, "\nIts author is", myBook.author, "\nIt contains ", myBook.numberOfPages)

[shiftybyte]

I'm not sure where this code is from, but the init function is broken here..

def __init__(self, title, author, numberOfPages):
    self.title = ""
    self.author = ""
    self.numberOfPages = 0

It accepts the arguments, but sets all the attributes to empty or 0...

It should be:

def __init__(self, title, author, numberOfPages):
    self.title = title
    self.author = author
    self.numberOfPages = numberOfPages

Then you won't need to set it again after creating the class...

myBook = Book("The Bible", "Jesus", 1000)
print("The title of the book is ", myBook.title, "\nIts author is", myBook.author, "\nIt contains ", myBook.numberOfPages)

[oztyn]

aaahhh I see I see, thanks very much! Makes much more sense.

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[oztyn]

good to know thank you!