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python - 将字典中的一些值相乘

问题描述

我正在编写一个程序，允许用户从菜单中选择选项，并在此基础上打印所选选项的详细信息。我需要将数量和价格相乘才能得到成本。问题是，我的价格和数量在嵌套字典中。如果用户选择选项 1> 3AB，它应该根据 3AB 的数量和价格打印出成本。我怎么做？

    stock = {
        '3AB': {'Name': 'Telcom', 'Purchase Date': '12/12/2018', 'Price': '1.55', 'Volume':'3000'},
        'S12': {'Name': 'S&P', 'Purchase Date': '12/08/2018', 'Price': '3.25', 'Volume': '2000'},
        'AE1': {'Name': 'A ENG', 'Purchase Date': '04/03/2018', 'Price': '1.45', 'Volume': '5000'}
        }

def menu():
    menuChoice =True

    while menuChoice:
        print ("""
        Menu
        1. List Holding and Sold details for a Stock
        2. Buy Stock
        3. Sell Stock
        4. list Holdings
        5. list Sold Stock
        0. Exit
        """)

        menuChoice= input("Enter Choice:  ")
        if menuChoice=="1": 
            option1()
        elif menuChoice=="2":
           print("\n Buy Stock") 
        elif menuChoice=="3":
           print("\n Sell Stock") 
        elif menuChoice=="4":
           print("\n List Holdings") 
        elif menuChoice=="5":
           print("\n List Sold Stock") 
        elif menuChoice=="0":
            break 
        elif menuChoice !="":
             print("\n Invalid. Please Re-enter choice: ")


def option1():
    input1 = input("Please enter code: ").lower()
    test = stock['3AB']['Volume'] * stock['3AB']['Price']
    print(test)
    if input1.upper() == "3AB":
        print("\nCode: " + input1.upper())
        print("Name: " + stock['3AB']['Name'])
        print("Last Purchase Date: " + stock['3AB']['Purchase Date'])
        print("Average Price: " + stock['3AB']['Price'])
        print("Volume: " + stock['3AB']['Volume'])
        print("Investment Cost ($): " + ())

    elif input1.upper() == "S12":
        print("\nCode: " + input1.upper())
        print("Name: " + stock['S12']['Name'])
        print("Last Purchase Date: " + stock['S12']['Purchase Date'])
        print("Average Price: " + stock['S12']['Price'])
        print("Volume: " + stock['S12']['Volume'])

    elif input1.upper() == "AE1":
        print("\nCode: " + input1.upper())
        print("Name: " + stock['AE1']['Name'])
        print("Last Purchase Date: " + stock['AE1']['Purchase Date'])
        print("Average Price: " + stock['AE1']['Price'])
        print("Volume: " + stock['AE1']['Volume'])

    else:
        print("Stock is not found in your portfolio.")
        print(input("Enter another option: "))

menu()

标签： pythonpython-3.x

解决方案

问题是您将值作为字符串存储在原始字典中。要解决它，您可以将值转换为浮点数：

test = float(stock['3AB']['Volume']) * float(stock['3AB']['Price'])

或者不要更改代码并将值存储为数字：

stock = {
        '3AB': {'Name': 'Telcom', 'Purchase Date': '12/12/2018', 'Price': 1.55, 'Volume':3000},
        'S12': {'Name': 'S&P', 'Purchase Date': '12/08/2018', 'Price': 3.25, 'Volume': 2000},
        'AE1': {'Name': 'A ENG', 'Purchase Date': '04/03/2018', 'Price': 1.45, 'Volume': 5000}
        }

顺便说一句，您的代码在下一行中仍然存在一个问题。您必须定义要打印的值：

print("Investment Cost ($): " + ())

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