將新物件附加到單獨變數中的串列

我對如何將新物件附加到串列有點困惑。我覺得我想多了，但如果我在這里走對了，請告訴我。

編輯：洗掉舊代碼

需要明確的是，我不想直接編輯 display() 中參考的文本檔案（然后讀取它），我想使用 append 方法將一本新書添加到串列的末尾。我使用分號通過拆分來獲取物件，所以當我添加新書時，它們是否也應該有分號以匹配串列的其余部分？

編輯：這就是我現在所擁有的。

class Book: 

    def __init__(self, title, author, isbn, callnumber, stock, loaned):
        self.title = title
        self.author = author
        self.isbn = isbn
        self.callnumber = callnumber
        self.stock = stock
        self.loaned = loaned
        self.available = int(self.stock)-int(self.loaned)

    def getTitle(self):
        return self.title

    def getAuthor(self):
        return self.author

    def getISBN(self):
        return self.isbn

    def getCallNumber(self):
        return self.callnumber

    def getStock(self):
        return self.stock

    def getLoaned(self):
        return self.loaned

    def getAvailable(self):
        return self.available

    def __repr__(self):
        return self.title   '\t'   self.author   '\t'   self.isbn   '\t'   self.callnumber   '\t'   self.stock   '\t'   self.loaned   '\n'

    def inventory():
        fmtstring = '''{:<50}\t{:<20}\t{:<13}\t{:<13}\t{:<10}\t{:<10}\t{:<10}'''
        print(fmtstring.format("Name","Author","ISBN","Call Number","Stock","Loaned","Available"))
        books = []
        with open("books.txt", "r") as inventoryfile:
            for line in inventoryfile:
                strip_lines=line.strip()
                inventory = strip_lines.split(";")
                book = (Book(inventory[0],inventory[1],inventory[2],inventory[3],inventory[4],inventory[5]))
                books.append(book)
                print(fmtstring.format(*fields(book)))

    @staticmethod
    def input_book():
        title = input("Provide the title of the book> ")
        author = input("Provide the author of the book> ")
        isbn = input("Provide the ISBN of the book> ")
        callnumber = input("Provide the call number of the book> ")
        stock = input("Provide the stock of the book> ")
        return Book(title, author, isbn, callnumber, stock, 0)


And these are called on with menu options.

    while True:
        print()
        print("Westlands Book Inventory Management Subsystem")
        print("1. Display Inventory")
        print("2. Add a Book")
        print("3. Remove a Book")
        print("4. Export Inventory")
        print("5. Quit IMS")
        choice=eval(input("Select an option from the menu> "))
        if(choice==1):
            print()
            print("Displaying Westlands Books Inventory")
            print()
            Book.inventory()
        
        elif(choice==2):
            print()
            print("Adding a Book")
            print()
            Book.input_book()
            print()
            print('Book added successfully.')

這是我的代碼的“安全”版本，不會破壞任何東西。我已經在各個地方嘗試了 append 命令，但似乎沒有用。我似乎根本無法回傳輸入到 input_books 中的內容。謝謝

uj5u.com熱心網友回復：

Book您從用戶輸入創建的函式應該只是return那樣，Book而不是嘗試將其添加到串列中（主要是因為：什么串列？）。如果它是 on 的方法Book，它應該是靜態方法（或類方法），而不是實體方法，因為它的重點是創建實體。例如：

@staticmethod
def input_book():
    title = input("Provide the title of the book> ")
    author = input("Provide the author of the book> ")
    isbn = input("Provide the ISBN of the book> ")
    callnumber = input("Provide the call number of the book> ")
    stock = input("Provide the stock of the book> ")
    return Book(title, author, isbn, callnumber, stock, 0)

現在在課堂之外，您Book可以執行以下操作：

books = []
while True:
    print()
    print("Westlands Book Inventory Management Subsystem")
    print("1. Display Inventory")
    print("2. Add a Book")
    choice = input("Select an option from the menu> ")
    if choice == "1":
        print(books)
    if choice == "2":
        print()
        print("Adding a Book")
        print()
        books.append(Book.input_book())
        print()
        print('Book added successfully.')

請注意，這books不是 a Book，而是slist的Booka 。

標籤：Python 目的 变量 输入 附加

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