Question

我正在尝试启用我的代码，以允许某人更新和删除清单中的房屋，该清单存储为字典。这是我的代码：

import random
import ast

all_homes = {} #Empty dictionary created to house inventory (get it?)

class Home_Inventory:
    """
    A class for available homes in inventory. 
    Options include adding, modifying, and removing houses. 
    Allows user to output dictionary to text file for ease of reading.
   """

     def __init__(self, sqrft, adr, city, state, zipcode, model, status):
        self.sqrft = sqrft + 'square feet'    # given integer
        self.address = adr
        self.zipcode = zipcode 
        self.city = city
        self.state = state
        self.model = model
        self.status = status #sold/available/contract

    def new_home(self):   # Add a new home to list
        adr = input('Enter street address: ')
        city = input('Enter city: ')
        state = input('Enter two-letter state acronym: ')
        zipcode = int(input('Enter zipcode: '))
        model = input('Enter model name: ')
        sqrft = int(input('Enter whole square feet: '))
        status = input('Is the house available, sold, or under contract?')

        home_attr = {'a':adr, 'c':city, 's':state, 'z':zipcode, 'f':sqrft, 'm':model, 'u':status}
        id_number = random.randint(1000,9999)   # Create an ID number for each house for easy finding
        all_homes[id_number] = home_attr

        print('Home successfully added to database.')

    def del_home(self):  # Delete a sold home from list
        del_home = input('ID number of sold home: ')
        if del_home in all_homes.keys(): # Make sure it exists in list
            del[del_home]
            print('This home has been deleted from database.')
        else:
            print('Not found.')

    def update_home(self):  # Modify attributes of home
        update_home = input('ID number of the house to modify:')

        if update_home in all_homes.keys(): # Make sure it exists in list
            edit_attr = input('Please select attribute to edit\n(f:feet, a: address, c: city, s: state, z: zipcode, m: model, u: status): ')
            updated_attr = input('Please enter updated value: ')
            all_homes[update_home].updatehome_attr(edit_attr, updated_attr)
        else: 
            print('Not found.')

    def output(self):     # Prints text file of listed homes
        f = open("HomeInventory.txt","a")   # Opens (or creates) a text file
        f.write(str(all_homes))   # Writes dictionary to text file
        f.close()   # Closes file

while True:
    print("1. Add a home")
    print("2. Remove a home")
    print("3. Update home")
    print("4. Print inventory")
    print("5. Exit program")
    user_wants=input("What would you like to do today? ")
    if user_wants=="1":
        Home_Inventory.new_home(input)
    elif user_wants=="2":
        Home_Inventory.del_home(input)
    elif user_wants=="3":
        Home_Inventory.update_home(input)
    elif user_wants=="4":
        Home_Inventory.output(input)
        print(all_homes)
    elif user_wants=="5":
        print("\n Thank you for using home inventory.")
        break

尤其是：无论我做了什么，由于某种原因，我似乎都无法更新或删除字典中的房屋。我输入密钥（ID号）并不断得到“未找到”结果。

此外，我似乎也无法弄清楚如何使字典仅允许更新一个属性，因为无论如何我什至都无法使字典拉取找到的地址...我已经添加了ID号，希望可以更简单地找到要更新/删除的目标属性，但似乎并没有太大帮助。

此外，我希望能够打开HomeInventory.txt文件，并在每次打开程序时将已经在其中创建的字典读取到程序中，以便用户可以退出程序，然后重新进入并修改房屋是在上一届会议上提出来的，但是我不确定该怎么做...非常感谢您的帮助！

Answer 1

del[del_home]创建列表[del_home]，然后将其删除。不太有用。

您的意思是del all_homes[del_home]

Answer 2

我知道了：

update_home = input('ID number of the house to modify:')

应该是：

update_home = int(input('ID number of the house to modify:'))

因为键是整数，而不是字符串。非常简单的修复程序让我发疯了一天！

对于属性，我更改了编码，以对home属性使用单个字典：

home_attr = {'a':address, 'c':city, 's':state, 'z':zipcode, 'f':feet, 'm':model, 'u':status}

，然后要求用户输入要编辑的属性的键，如下所示：

    edit_attr = str(input("Please select attribute to edit\n('f':feet, 'a': address, 'c': city, 's': state, 'z': zipcode, 'm': model, 'u': status): "))
    updated_attr = input('Please enter updated value: ')
    new_home_attr = all_homes[update_home_id]
    new_home_attr[edit_attr] = updated_attr
    all_homes[update_home_id] = new_home_attr

我仍然不知道如何从文本文件中读取字典，然后仅导入新字典，但这仍然超出了该类的范围。

字典-从字典信息的文本文件中查找和更新条目

2 个答案: