Python中调用对象属性失败，请求排查代码问题

核心问题与修复： #

• 拼写错误：editbook方法中self.publsiher是拼写错误，改为self.publisher即可修复属性赋值失败的问题。

除此之外，代码还有几处Python OOP使用错误，一并修正如下：

1. __init__参数不匹配
   原构造函数只接收3个参数，但创建实例时传入了9个属性值，需要补充完整的属性初始化：

def __init__(self, title, publisher, edition, year, month, language, paperback, isbn10, isbn13):
    self.title = title
    self.publisher = publisher
    self.edition = edition
    self.year = year
    self.month = month
    self.language = language
    self.paperback = paperback
    self.isbn10 = isbn10
    self.isbn13 = isbn13

2. infofile改为类方法
   原方法没有类/实例参数，无法通过实例调用，添加@classmethod装饰器并使用cls创建实例：

@classmethod
def infofile(cls, filename):
    books = []
    try:
        with open(filename, "r") as file:
            for line in file:
                bookinfo = line.strip().split(",")
                title,publisher,edition,year,month,language,paperback,isbn10,isbn13 = bookinfo
                book = cls(title,publisher,int(edition),int(year),int(month),language,paperback,int(isbn10),int(isbn13))
                books.append(book)
    except FileNotFoundError:
        print(f"File not found:{filename}")
    return books

3. displaybook遍历逻辑错误
   遍历书籍列表时，应该用循环变量book访问当前实例的属性，而非self（self是调用该方法的实例）：

def displaybook(self):
    books = Book.infofile(input("Enter File name:"))
    for book in books:
        print(f"Title:{book.title}")
        time.sleep(1)
        print(f"Publisher:{book.publisher}")
        time.sleep(1)
        print(f"Edition:{book.edition}")
        time.sleep(1)
        print(f"Year:{book.year}")
        time.sleep(1)
        print(f"Month:{book.month}")
        time.sleep(1)
        print(f"Language:{book.language}")
        time.sleep(1)
        print(f"Paperback:{book.paperback}")
        time.sleep(1)
        print(f"ISBN-10:{book.isbn10}")
        time.sleep(1)
        print(f"ISBN-13:{book.isbn13}")

完整修正后的代码： #

import time
import string

class Book:
    """ This is a class with methods regarding the book itself """
    
    bookcopies = 0 #variable to keep track of bookcopies, initially = 0, once a book is added, update to 1

    @classmethod
    def infofile(cls, filename):
        books = []
        try:
            with open(filename, "r") as file:
                for line in file:
                    bookinfo = line.strip().split(",")
                    title,publisher,edition,year,month,language,paperback,isbn10,isbn13 = bookinfo
                    book = cls(title,publisher,int(edition),int(year),int(month),language,paperback,int(isbn10),int(isbn13))
                    books.append(book)
        except FileNotFoundError:
            print(f"File not found:{filename}")
        return books
    
    def displaybook(self):
        books = Book.infofile(input("Enter File name:"))
        for book in books:
            print(f"Title:{book.title}")
            time.sleep(1)
            print(f"Publisher:{book.publisher}")
            time.sleep(1)
            print(f"Edition:{book.edition}")
            time.sleep(1)
            print(f"Year:{book.year}")
            time.sleep(1)
            print(f"Month:{book.month}")
            time.sleep(1)
            print(f"Language:{book.language}")
            time.sleep(1)
            print(f"Paperback:{book.paperback}")
            time.sleep(1)
            print(f"ISBN-10:{book.isbn10}")
            time.sleep(1)
            print(f"ISBN-13:{book.isbn13}")
        

    def __init__(self, title, publisher, edition, year, month, language, paperback, isbn10, isbn13): 
        self.title = title
        self.publisher = publisher
        self.edition = edition
        self.year = year
        self.month = month
        self.language = language
        self.paperback = paperback
        self.isbn10 = isbn10
        self.isbn13 = isbn13

    def editbook(self, newtitle, newpublisher, newedition): 
        self.title = newtitle
        self.publisher = newpublisher
        self.edition = newedition

内容的提问来源于stack exchange，提问作者Sara Mansour