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class Book:

def __init__(self, name: str, page_count: int):

self.name = name

self.page_count = page_count

self.pages_read = 0

def __repr__(self):

return (

f"<Book {self.name}, read {self.pages_read} pages out of {self.page_count}>"

)

def read(self, pages: int):

self.pages_read += pages

print(f"You have now read {self.pages_read} pages out of {self.page_count}")

python101 = Book("Python 101", 50)

python101.read(35)

python101.read(50) # Whaaaat

# -- Errors used to prevent things from happening --

class TooManyPagesReadError(ValueError):

pass

class Book:

def __init__(self, name: str, page_count: int):

self.name = name

self.page_count = page_count

self.pages_read = 0

def __repr__(self):

return (

f"<Book {self.name}, read {self.pages_read} pages out of {self.page_count}>"

)

def read(self, pages: int):

if self.pages_read + pages > self.page_count:

raise TooManyPagesReadError(

f"You tried to read {self.pages_read + pages} pages, but this book only has {self.page_count} pages."

)

self.pages_read += pages

print(f"You have now read {self.pages_read} pages out of {self.page_count}")

python101 = Book("Python 101", 50)

python101.read(35)

python101.read(

50

) # This now raises an error, which has a helpful name and a helpful error message.