将类作为参数传递给python中其他类中的方法

我是python新手，我有一个项目要求构建一个购物车。它有一个具体的要求，我应该去。我一直坚持使用makeadd方法和remove方法。 如何使用类作为方法的参数，为什么

下面是我的ItemToPurchase的样子

class ItemToPurchase:
    def __init__(self, item_name, item_price, item_quantity, item_description):
        self.item_name = item_name
        self.item_price = item_price
        self.item_quantity = int(item_quantity)
        self.item_description = item_description

    def print_item_cost(self):
        if self.item_price <=0:
            raise ValueError('Invaild price')
        price_for_quntatity = self.item_price * self.item_quantity
        print('%s %d @ %d = %d'%(self.item_name, self.item_quantity, self.item_price, price_for_quntatity ))
    def __str__(self):
        return ('%s'%(self.item_description))

class ItemToPurchase：
定义初始（自身、项目名称、项目价格、项目数量、项目描述）：
self.item\u name=item\u name
self.item\u price=item\u price
self.item\u quantity=int（item\u quantity）
self.item\u description=item\u description
def打印项目成本（自身）：
如果self.item_price您不添加
类
作为参数。类是数据的形状和定义的动作

你给你的购物车提供了
ItemToPurchase
的“实例”-充满数据的具体对象-而不是“形状”


实例用法和类的示例：

class Fruit:
    """POCO for a fruit with a name and size"""
    def __init__(self, name, size):
        self.name = name
        self.size = size
    # TODO: needs some more __xxxx__ implemented

class FruitBasket:
    """Basket for fruits, has a finite size."""
    def __init__(self,size= 10):
        self.size = size
        self.fruitsInIt = []

    def addFruit(self, fruit:Fruit):
        """Add a fruit if size fits, prints output for added/not added."""
        currSize = sum( x.size for x in self.fruitsInIt)
        if currSize+fruit.size > self.size:
            print("Can not fit {} size {} in, its too big. Remaining space: {}"
                  .format(fruit.name, fruit.size, self.size-currSize))
        else:
            print("Putting {} in. Remaining space: {}".format(fruit.name, self.size-currSize-fruit.size))
            self.fruitsInIt.append(fruit)

    def view(self):
        """Print all fruits with sizes"""
        for f in self.fruitsInIt:
            print(f.name, f.size)

    def eatAll(self,fruitName:str):
        """If present, eat all fruits of given name, else print message"""
        if not fruitName in [x.name for x in self.fruitsInIt]:
            print("No {} left :((".format(fruitName))
            return
        for f in self.fruitsInIt:
            if f.name == fruitName:
                print("Eating {} of size {}.".format(f.name, f.size))
            else:
                print("Do not like {}.".format(f.name))

        self.fruitsInIt = [x for x in self.fruitsInIt if x.name != fruitName]

import random # for random data


fruits = ["Apple", "Orange", "Melon", "Banana"]

b = FruitBasket(12) # instance of basket with size 12
for _ in range(10): # try to add 10 random fruits
    b.addFruit(Fruit(random.choice(fruits), random.randint(1,3)))

b.view()    # show basket
b.eatAll("Apple")   # eat all apples (if any in)
b.view()    # show basket again

输出：

# adding things to basket
Putting Banana in. Remaining space: 10
Putting Melon in. Remaining space: 9
Putting Banana in. Remaining space: 6
Putting Orange in. Remaining space: 5
Putting Melon in. Remaining space: 2
Can not fit Melon size 3 in, its too big. Remaining space: 2
Putting Melon in. Remaining space: 1
Can not fit Melon size 3 in, its too big. Remaining space: 1
Can not fit Melon size 3 in, its too big. Remaining space: 1
Can not fit Apple size 3 in, its too big. Remaining space: 1

# viewing basket
Banana 2
Melon 1
Banana 3
Orange 1
Melon 3
Melon 1

# eatAll  apples
No Apple left :((

# view basket again
Banana 2
Melon 1
Banana 3
Orange 1
Melon 3
Melon 1

检查此项可能满足您的需求：-

import datetime
class Customer_name:
    def __init__(self,name):
        self.cust_name = name
        self.time = str(datetime.datetime.now())
        self.item_list = []

    def add_item(self,item_name, item_price, item_quantity, item_description):
        self.item_name = item_name
        self.item_price = item_price
        self.item_quantity = int(item_quantity)
        self.item_description = item_description
        self.item_list.append(([self.item_name,self.item_price,self.item_quantity,self.item_description]))

    def remove_item(self,check_item):
        for item in self.item_list:
            if check_item in item:
                self.item_list.remove(item)
                return   

    @property
    def cart_items(self):
        return self.item_list 

    @property
    def print_item_cost(self):
        if self.item_price <=0:
            raise ValueError('Invaild price')
        price_for_quntatity = self.item_price * self.item_quantity
        return ('Cust Name:{} {} {}@{}= {} date {}'.format(self.cust_name,self.item_name, self.item_quantity, self.item_price,price_for_quntatity,self.time ))


a = Customer_name("John")
a.add_item('apple',20,10,"good for health")
a.add_item("Mango",50,30,"tasty")
a.add_item("Guava",50,30,"tasty")
a.add_item("Orange",50,30,"tasty")
a.remove_item("Mango")
print(a.cart_items)
print(a.print_item_cost)

导入日期时间
类别客户名称：
定义初始化（self，name）：
self.cust_name=名称
self.time=str（datetime.datetime.now（））
self.item_list=[]
def添加项目（自身、项目名称、项目价格、项目数量、项目说明）：
self.item\u name=item\u name
self.item\u price=item\u price
self.item\u quantity=int（item\u quantity）
self.item\u description=item\u description
self.item\u list.append（[self.item\u name，self.item\u price，self.item\u quantity，self.item\u description]））
def移除项目（自身、检查项目）：
对于self.item_列表中的项目：
如果选中项目中的项目：
self.item_list.remove（项目）
回来
@财产
def cart_项目（自身）：
返回self.item\u列表
@财产
def打印项目成本（自身）：
如果self.item_price，但据说是ShoppingCart类中的add_item（）方法将以ItemToBurchase作为参数，ItemToBurchase是一个类。加上所有这些类都在同一个文件中，所以我不需要import@MariamAdel您不需要导入
datetime
模块吗？Python不是强类型的。您可以创建
添加项目（self，blablubb）：
to
ShoppingCart-
blablubb`就是给定参数在该函数中使用时的名称。然后在调用它时将一个具体的ItemToPurchase对象放入其中…为什么您的类命名为
customer\u name
-类开始使用capital，而它是一个
购物车
。为什么您的
customer\u name
属性属于一个
itemtopourchase
？你为什么根本不使用
itemtopourchase
？
import datetime
class Customer_name:
    def __init__(self,name):
        self.cust_name = name
        self.time = str(datetime.datetime.now())
        self.item_list = []

    def add_item(self,item_name, item_price, item_quantity, item_description):
        self.item_name = item_name
        self.item_price = item_price
        self.item_quantity = int(item_quantity)
        self.item_description = item_description
        self.item_list.append(([self.item_name,self.item_price,self.item_quantity,self.item_description]))

    def remove_item(self,check_item):
        for item in self.item_list:
            if check_item in item:
                self.item_list.remove(item)
                return   

    @property
    def cart_items(self):
        return self.item_list 

    @property
    def print_item_cost(self):
        if self.item_price <=0:
            raise ValueError('Invaild price')
        price_for_quntatity = self.item_price * self.item_quantity
        return ('Cust Name:{} {} {}@{}= {} date {}'.format(self.cust_name,self.item_name, self.item_quantity, self.item_price,price_for_quntatity,self.time ))


a = Customer_name("John")
a.add_item('apple',20,10,"good for health")
a.add_item("Mango",50,30,"tasty")
a.add_item("Guava",50,30,"tasty")
a.add_item("Orange",50,30,"tasty")
a.remove_item("Mango")
print(a.cart_items)
print(a.print_item_cost)