why this program is showing error?

Question

class book:
def __init__(self,a,b,c,d,e):
self.title=a
self.author=b
self.publisher=c
self.price=d
self.author_royality=e
def showinfo(self):
print('title:', self.title)
print('author:', self.author)
print('publisher:', self.publisher)
print('price:', self.price)
print('author_royality:', self.author_royality)

Answer 1

Doesn't really match your other question where it says "Provide getter and setter properties for all variables. Also define a method royalty() to calculate royalty amount author can expect to receive the following royalties (...)"

A getter method is defined like this:

@property
def price(self):
return self._price

A setter method is defined like this:

@price.setter
def price(self, price):
self._price = price

For the royalty class method, I'd make a static method as I think the method is the same for all books and you want to be able to call the method without referencing a specific instance of the class:

@staticmethod
def royalties(retail_price, copies_sold):
# calculate royalties here
return royalties

Answer 2

You need to define getters and setters for all properties

Answer 3

It won't show any error, everything seems fine. To make books you will need to define a new book and give it the attributes a,b,c,d,e

Example:
book1 = book("any_title", "any_author", "any_publisher", "any_price", "anyauthor_royality")

Then you can say: print(book1.showinfo())

Answer 4

after making object and calling showinfo method it is showing bound error

Answer 5

<bound method book.showinfo of <__main__.book object at 0x03066190>>

Answer 6

static method cannot modify the state of object but i also have to change the state of object