我想向客户库 (dict) 添加一个新客户并将其保存在 dict 中，这样当我想添加另一个客户时，它会添加而不是替换它们

Question

这是我在 LibraryCustomers.py 模块中使用的代码：

class Customer:

    """
    A class that represents the Customer object
    """

    
    def __init__(self,customer_id,customer_name,customer_city,customer_age):

"""
A function that contains all the relevant information of customers
:param customer_id: Customer's ID
:param customer_name: Customer's name
:param customer_city: Customer's city of living
:param customer_age: Customer's age'
"""

        

        self.customer_id = customer_id
        self.customer_name = customer_name
        self.customer_city = customer_city
        self.customer_age = customer_age
    
    def add_new_customer(self,customer_id, customer_name, customer_city, customer_age):


        """
        A function that add new customer to the Library
        :param customer_id: Customer's ID'
        :param customer_name: Customer's name'
        :param customer_city: Customer's city'
        :param customer_age: Customer's age'
        """


        new_customer = {'customer id':{customer_id}, 'customer name':{customer_name}, 'customer city':{customer_city}, 'customer age':{customer_age}}
        return new_customer

这是我在 main.py 中使用的代码：添加新客户（基于输入）

            customer_id_input = input("Enter customer's ID: ")
      " adding customer id "
            customer_name_input = input("Enter customer's name: ")
        " adding customer name"
            customer_city_input = input("Enter customer's city: ")
         " adding customer city"
            customer_age_input = input("Enter customer's age: ")
          " adding customer age"



            new_customers = Customer.add_new_customer(customers_library,customer_id_input,customer_name_input,customer_city_input,customer_age_input)
            customers_library.update(new_customers)
            # updated_customers_library = json.dumps(customers_library)
            print("Added customer...")
            print("Done!, Customer added successfully")
            print(f"\n{customers_library}")

每次我运行这段代码都不会将新客户添加到 main.py

中的客户字典中

Answer 1

update 用于 update/insert 到现有字典中。对于新项目，使用键将其添加到字典中。但在你的情况下，如果你计划拥有多个客户，也许 customers_library 应该是客户列表，而不是字典？

class Customer:
    def __init__(self, customer_id, customer_name, customer_city, customer_age):
        self.customer_id = customer_id
        self.customer_name = customer_name
        self.customer_city = customer_city
        self.customer_age = customer_age

    @staticmethod
    def create():
        customer_id_input = input("Enter customer's ID: ")
        customer_name_input = input("Enter customer's name: ")
        customer_city_input = input("Enter customer's city: ")
        customer_age_input = input("Enter customer's age: ")
        return Customer(customer_id_input,
                        customer_name_input,
                        customer_city_input,
                        customer_age_input)

    def __str__(self):
        return f"{self.customer_id},{self.customer_name},{self.customer_city},{self.customer_age}"

class Library:
    def __init__(self):
        self.customers = []

    def new_customer(self):
        self.customers.append(Customer.create())

    def __str__(self):
          return '\n'.join((str(c) for c in self.customers))

customers_library = Library()
print("Added customer...")
customers_library.new_customer()
customers_library.new_customer()
print("Done!, Customer added successfully")
print(customers_library)

要使用字典而不是列表，请将 Library class 更改为：

class Library:
    def __init__(self):
        self.customers = {}

    def new_customer(self):
        customer = Customer.create()
        # Here, the key is the id, but can be anything
        self.customers[customer.customer_id] = customer

    def __str__(self):
          return '\n'.join((str(c) for c in self.customers.values()))

我想向客户库 (dict) 添加一个新客户并将其保存在 dict 中，这样当我想添加另一个客户时，它会添加而不是替换它们

I want to add a new customer to the customers library (dict) and to save it in the dict so when I want to add another it'll add and not replace them

python

python-3.10