使用Python中的 JSON 进行库存管理

库存管理系统用于管理商店产品并跟踪所有商品库存，我们也可以使用它来检查商店的购买历史。基本上，我们正在开发一个系统，通过使用计算机来管理/自动化任何零售店的某些流程。因此，通过使用该系统，我们可以保存产品的记录数据，甚至所有购买都发生在店内。

所以在这里我们将使用Python开发一个库存管理系统，我们将使用 JSON 文件来存储数据。首先，我们将使用Python代码本身创建示例数据，然后将所有功能一一开发。

我们必须在每个函数上打开 JSON 文件并以Python字典格式加载 JSON 数据，然后再次反转将字典数据转换回 JSON 格式然后关闭文件的过程。

创建数据并添加到 JSON 文件中：

让我们在Python字典中生成数据。

Python3

import json
  
# Creating Dictionary to store data
available_products = {1001: {"name": "avacado", "price": 230,
                             "category": "grocery",
                             "quantity": 10, "date": "10/03/2021"},
                      1002: {"name": "lotion", "price": 250,
                             "category": "beauty & personal", 
                             "quantity": 100,
                             "date": "15/07/2021"},
                      1003: {"name": "pain reliever", "price": 500, 
                             "category": "health",
                             "quantity": 200, "date": "12/04/2021"},
                      1004: {"name": "dry pasta", "price": 20, 
                             "category": "grocery",
                             "quantity": 50, "date": "27/06/2021"},
                      1005: {"name": "toothbrush", "price": 700,
                             "category": "beauty & personal", 
                             "quantity": 100,
                             "date": "30/01/2021"},
                      1006: {"name": "halloween candy", "price": 33,
                             "category": "grocery",
                             "quantity": 56, "date": "22/02/2021"},
                      1007: {"name": "mascara", "price": 765,
                             "category": "beauty & personal", 
                             "quantity": 70,
                             "date": "11/03/2021"},
                      1008: {"name": "capsicum", "price": 764,
                             "category": "grocery",
                             "quantity": 90, "date": "16/02/2021"},
                      1009: {"name": "blush", "price": 87,
                             "category": "beauty & personal",
                             "quantity": 50, "date": "17/07/2021"},
                      1010: {"name": "granola bars", "price": 24,
                             "category": "grocery", "quantity": 60,
                             "date": "20/05/2021"},
                      }
  
# Formatting Dictionary into JSON format
js = json.dumps(available_products)
''' json.dumps() function converts a Python object into a json string '''
js  # so we got all data in json string format here
  
# Create Jason File for DataBase and Write data Into File
fd = open("data.json", 'w')
  
fd.write(js)  # writing string into file
fd.close()  # Close File After Inserting Data

所以我们已经为我们的库存管理系统创建了数据，现在我们必须创建函数来访问这些数据并在其上处理各种功能。

所以对于这个系统，我们将添加两个主要部分

• 管理员级别的功能。 （供系统管理员操作）
• 用户级功能。 （将由客户使用）

管理员级功能

基本上，这仅用于管理具有额外权限的人员的库存，例如插入、更新和删除应仅在所有者或经理级别的产品详细信息。

以下函数将有助于在管理功能之间进行协调

蟒蛇3

def admin():
    print("============= Welcome to the Admin Inventory Management System =====")
      
    while (1):
        print("1)Display DataBase/All Products with there details")
        print("2)Display Specific Product with its details")
        print("3)Insert Data Into DataBase")
        print("4)Update Product in Database")
        print("5)Delete Product in DataBase")
        print("6)Display User Purchase Reports")
        print("7)Exit")
        print("Enter Your Choice :- ")
          
        n = int(input())
        if (n == 1):
            display_data()
        elif (n == 2):
            display_specific_data()
        elif (n == 3):
            add_new()
        elif (n == 4):
            update_prod_data()
        elif (n == 5):
            delete_prod()
        elif (n == 6):
            display_reports_admin()
        elif (n == 7):
            break
        else:
            print("Invalid Choice...!!!")

该级别将提供以下功能

1. 显示库存中所有产品的函数

在此函数中，管理员将有两个选项，要么他想要数据库中的所有列表，要么他想要按类别查看所有产品。

注意：为了使它在表格格式中看起来不错，我们将使用 Pandas。

蟒蛇3

def display_data():
    import pandas as pd
    import json
    fd = open("data.json", 'r')  # Open file in read mode
    txt = fd.read()  # reading data from file
    data = json.loads(txt)
      
    # This will parse the JSON data,
    # populates a Python dictionary with the data
    fd.close()
    print("Enter '0' To Display Data Category Wise or '1' \
    To Show Data As its Sequence Of Insertion :- ")
    n = int(input())
      
    # Display All Records
    if (n == 1):
        table = pd.DataFrame(
            columns=['ID', 'name', 'price', 'category',
                     'quantity', 'date'])
          
        # Creating Pandas dataframe to show data in table 
        # format later
        for i in data.keys():
            '''Fetch all keys in dictionary'''
            temp = pd.DataFrame(columns=['ID'])
            temp['ID'] = [i]
              
            for j in data[i].keys():
                temp[j] = [data[i][j]]
            table = table.append(temp)
        table = table.reset_index(drop=True)
          
        # This will reset index of dataframe
        from IPython.display import display
        display(table)
    elif (n == 0):
        
        # Display Records by Category
        table = pd.DataFrame(
            columns=['ID', 'name', 'price', 'category', 
                     'quantity', 'date'])
        cat = []
          
        for i in data.keys():
            temp = pd.DataFrame(columns=['ID'])
            temp['ID'] = [i]
            for j in data[i].keys():
                temp[j] = [data[i][j]]
                if (j == 'category'):
                    cat.append(data[i][j])
            table = table.append(temp)
            table = table.reset_index(drop=True)
            cat = set(cat)
            cat = list(cat)
              
        for k in cat:
            temp = pd.DataFrame()
            temp = table[table['category'] == k]
            print("Data Of Products Of Category "+k+" is:- ")
            from IPython.display import display
            display(temp)
    else:
        print("Enter Valid Choice...!!!")
          
# display_data() # Uncomment This Line To Run This Function
# Note :- Ensure You Have data.json File to Fetch Data

2. 显示特定产品详情的函数：

在此函数中，管理员必须输入产品的产品 ID 才能查看他想要检查的详细信息，他将获得有关该特定产品的所有详细信息。

蟒蛇3

def display_specific_data():
    import pandas as pd
    import json
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter Product ID Whoes Details You Want to Have a Look on :- ")
    i = input()
      
    # Follwing Code will Filter out Product ID from Records
    if i in data.keys():
        temp = pd.DataFrame(columns=['ID'])
        temp['ID'] = [i]
          
        for j in data[i].keys():
            temp[j] = [data[i][j]]
              
        from IPython.display import display
        display(temp)
    else:
        print("You Have Entered Wrong Product ID \
        that is not Present in DataBase...!!!")
  
  
# display_specific_data() # Uncomment This Line To Run This Function
# Note :- Ensure You Have data.json File to Fetch Data

3. 在库存中添加新产品的插入函数：

此函数将允许管理员在库存中添加新产品详细信息。如果管理员想要添加除基本 5 个属性/详细信息以外的其他属性，还提供为特定产品添加新属性的功能。

注意：这里程序更具体地涉及我们插入的数据，我们可以进行更改以使其适用于所有类型

蟒蛇3

def add_new():
    import json
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter New Product ID :- ")
    id = input()
      
    if id not in data.keys():
        print("Enter Product Name :- ")
        name = input()
          
        print("Enter Price of Product(price for product quantity as 1) :- ")
        price = input()
          
        print("Enter Category of Product :- ")
        category = input()
          
        print("Enter Quantity of Product :- ")
        quantity = input()
          
        print("Enter The Date on Which Product is Added in Inventory :- ")
        date = input()
          
        data[id] = {'name': name, 'price': price,
                    'category': category, 'quantity': quantity, 'date': date}
        print("Please Press '0' to Add New Attributes\
        /Properties of Product or Press '1' to Continue :- ")
        z = int(input())
          
        if(z == 0):
            print("Enter Number of New Attributes/Properties of Product :- ")
            n = int(input())
              
            for i in range(n):
                print("Enter Attribute Name That you Want To Add :- ")
                nam = input()
                print("Enter The "+str(nam)+" of Product :- ")
                pro = input()
                data[id][nam] = pro
        print("Product ID "+str(id)+" Added Successfully...!!!")
          
    else:
        print("The Product ID you Have Entered Is Already Presen\
        t in DataBase Please Check...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
      
# add_new() # Uncomment This Line To Run This Function
# Note :- Ensure You Have data.json File to Fetch Data

4. 删除库存中的产品：

在这里管理员可以删除缺货或想要删除的产品。此外，它会在无效的产品 ID 上引发错误。

蟒蛇3

def delete_prod():
    import json
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter The Product ID of The Product Which You Want To Delete :- ")
    temp = input()
      
    if temp in data.keys():
        
          # here we are removing that particular data
        data.pop(temp)  
        print("Product ID "+str(temp)+" Deleted Successfully...!!!")
    else:
        print("Invalid Product ID...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
      
# delete_prod() # Uncomment This Line To Run This Function
# Note :- Ensure You Have data.json File to Fetch Data

5. 更新产品数据：

此函数将为管理员提供两个选项，他是要更新产品的所有详细信息，还是要编辑产品的任何特定详细信息/属性。此外，它会在无效的产品 ID 上引发错误。

蟒蛇3

def update_prod_data():
    import json
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter The Product ID of The Product\
    Which You Want To Update :- ")
    temp = input()
      
    if temp in data.keys():
        print("Want to update whole product data\
        press '0' else '1' for specific data :- ")
        q = int(input())
        if (q == 0):
            
            print("Enter Product Name :- ")
            name = input()
              
            print("Enter Price of Product(price for product quantity as 1) :- ")
            price = input()
              
            print("Enter Category of Product :- ")
            category = input()
              
            print("Enter Quantity of Product :- ")
            quantity = input()
              
            print("Enter The Date on Which Product is Added in Inventory :- ")
            date = input()
              
            data[temp] = {'name': name, 'price': price,
                          'category': category, 'quantity': quantity,
                          'date': date}
            print(
                "Please Press '0' to Add more Attributes\
                /Properties of Product or Press '1' to Continue :- ")
            z = int(input())
            if(z == 0):
                print("Enter Number of New Attributes/Properties of Product :- ")
                n = int(input())
                  
                for i in range(n):
                    print("Enter Attribute Name That you Want To Add :- ")
                    nam = input()
                    print("Enter The "+str(nam)+" of Product :- ")
                    pro = input()
                    data[temp][nam] = pro
            print("Product ID "+str(temp)+" Updated Successfully...!!!")
              
        elif(q == 1):
            print("Enter Which Attribute of Product You want to Update :- ")
            p = input()
              
            if p in data[temp].keys():
                print("Enter "+str(p)+" of Product :- ")
                u = input()
                data[temp][p] = u
                print("Product ID "+str(temp)+"'s attribute " +
                      str(p)+" is Updated Successfully...!!!")
            else:
                print("Invalid Product Attribute...!!!")
        else:
            print("Invalid Choice...!!!")
    else:
        print("Invalid Product ID...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
      
# update_prod_data() # Uncomment This Line To Run This Function
# Note :- Ensure You Have data.json File to Fetch Data

6. 向管理员显示用户购买报告：

管理员可以通过两个选项查看用户购买情况，例如他想要查看所有购买报告或想要查看任何特定客户/用户的购买报告。这也提供功能以显示一条消息，如果任何用户没有发生购买，则不存在报告。此外，它会在无效的用户 ID 上引发错误。

蟒蛇3

def display_reports_admin():
    import os.path
    import pandas as pd
    import json
    if (os.path.isfile("user_data.json") is False):
        
        # Check for if file is present or not
        # File will be generated only
        # if any user will do some purchase
        print("No User Reports are Present")
        return
        
    fd = open("user_data.json", 'r')
    txt = fd.read()
    user_data = json.loads(txt)
    fd.close()
    print("Enter '0' to Check All Bills/Reports and \
    '1' To Check Specific User Bills/Reports :- ")
    n = int(input())
      
    if (n == 1):
        print("Enter User ID Whoes Details You Want to Have a Look on")
        i = input()
        temp = pd.DataFrame()
          
        if i in user_data.keys():
            for j in user_data[i].keys():
                d = dict()
                d['User ID'] = i
                d['Purchase Number'] = j
                for k in user_data[i][j].keys():
                    d[k] = user_data[i][j][k]
                temp = temp.append(d, ignore_index=True)
                d = dict()
            temp = temp.reset_index(drop=True)
              
            from IPython.display import display
            display(temp)
              
        else:
            print("You Have Entered Wrong User ID that is not Present in DataBase...!!!")
    elif (n == 0):
        table = pd.DataFrame()
          
        for i in user_data.keys():
            temp = pd.DataFrame()
              
            for j in user_data[i].keys():
                d = dict()
                d['User ID'] = i
                d['Purchase Number'] = j
                  
                for k in user_data[i][j].keys():
                    d[k] = user_data[i][j][k]
                temp = temp.append(d, ignore_index=True)
                d = dict()
            table = table.append(temp)
        table = table.reset_index(drop=True)
        from IPython.display import display
        display(table)
    else:
        print("Please Enter Valid Choice...!!!")
  
# display_reports_admin() # Uncomment This Line To Run This Function
# Note :- Ensure You Have data.json File to Fetch Data

7. Delete Whole Database（删除整个库存记录）：

如果管理员想全部清除，也可以删除整个数据库。

蟒蛇3

def delete_all():
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    data = {}  # Replacing Data with NULL Dictionary
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()

用户级功能：

这基本上就像客户可以操作购买产品并获取他的账单和以前的账单记录也没有功能或访问产品以插入或修改或删除它。

以下函数将有助于在管理功能之间进行协调

蟒蛇3

def user():
    print("===============\
    Welcome to the User Inventory Management System\
    ===============================================")
      
    while (1):
        print("1)Display All Products With Deatils")
        print("2)Display Specific Product With Deatils")
        print("3)Display All Purchase Bills")
        print("4)Buy The Product")
        print("5)Exit")
        print("Enter Your Choice :- ")
        n = int(input())
        if (n == 1):
            display_data()
        elif (n == 2):
            display_specific_data()
        elif (n == 3):
            display_user_data()
        elif (n == 4):
            buy_product()
        elif (n == 5):
            break
        else:
            print("Invalid Choice...!!!")

以下是用户级别的功能

注意：在用户购买东西之前，我们应该向他展示库存中所有可用产品的列表，以便我们可以使用我们为 admin 创建的相同函数来显示产品。

1. 显示用户购买报告：

此函数将帮助用户跟踪他的购买和直到今天的所有账单报告。此外，如果用户输入用户 ID，此函数仅向用户提供信息。 （我们也可以在这里添加密码功能以增加更多功能）

蟒蛇3

def display_user_data():
    import os.path
    import json
      
    if (os.path.isfile("user_data.json") is False):
        print("No User Reports are Present")
        return
        
    fd = open("user_data.json", 'r')
    txt = fd.read()
    user_data = json.loads(txt)
    fd.close()
    print("Enter your User ID to Display All your Bills :- ")
    i = input()
    temp = pd.DataFrame()
      
    if i in user_data.keys():
        for j in user_data[i].keys():
            d = dict()
            d['User ID'] = i
            d['Purchase Number'] = j
            for k in user_data[i][j].keys():
                d[k] = user_data[i][j][k]
            temp = temp.append(d, ignore_index=True)
            d = dict()
        temp = temp.reset_index(drop=True)
          
        from IPython.display import display
        display(temp)
    else:
        print("You Have Entered Wrong User ID that is not Present in DataBase...!!!")

2. 创建账单的函数：

用户/客户将在购买后立即收到有关他购买的账单，并带有唯一的 10 位交易 ID。如果用户一次购买多个产品，它将给出一个汇总账单。

蟒蛇3

def generate_bill(user_id, prod_id, price, time_date, 
                  purchase_no, name, category,
                  quantity_all, transaction_id):
    print("================================\
  ================= Bill ================\
  =================================")
    print("########################################")
    print("   User ID :-", user_id)
    print("############################################")
    amount = 0
    n = len(purchase_no)
      
    for i in range(n):
        print("--------------------------------------")
        amount = amount+float(price[i])*float(quantity_all[i])
        print("Purchase number", purchase_no[i], 
              "\nPurchase Time :-", time_date[i], 
              "\nProduct ID :-", prod_id[i],
              "\nName Of Product :-",
              name[i], "\nCategory Of Product :-", category[i], 
              "\nPrice of Product per Item :-", price[i],
              "\nPurchase Quantity :-", quantity_all[i])
        print("-------------------------------------------------")
    print("*********************************************************")
    print("      Total Payable Bill :-",
          amount, "Transaction ID :-", transaction_id)
    print("*************************************")

3. 用户购买产品函数：

这是这部分的主要函数这将允许用户/客户购买产品 如果客户购买的产品数量多于库存，则会出现错误 如果他想省力，用户将有更多的机会更正数量或重新启动该过程，或者他也可以跳过该产品。此外，如果产品不在库存中（数量 = 0），客户将收到缺货消息。客户可以通过使用产品 ID 同时购买多个产品（我们也可以通过名称添加购买产品）用户/客户如果输入错误的选择将出现错误消息。

蟒蛇3

def buy_product():
    import time
    import random
    import os.path
      
    if (os.path.isfile("user_data.json") is False):
        user_data = {}
    else:
        fd = open("user_data.json", 'r')
        txt = fd.read()
        user_data = json.loads(txt)
        fd.close()
          
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter Your User ID if You are Old Customer\
    else press '0' To New User ID :- ")
    p = int(input())
      
    if (p == 0):
        if (len(user_data.keys()) == 0):
            user_id = 1000
        else:
            user_id = int(list(user_data.keys())[-1])+1
    else:
        if str(p) in user_data.keys():
            user_id = p
        else:
            user_id = -1
              
    if (user_id != -1):
        user_id = str(user_id)
        price = []
        time_date = []
        purchase_no = []
        name = []
        category = []
        quantity_all = []
        prod_id = []
        transaction_id = ''.join(random.choice(
            '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ') for i in range(10))
        print("Enter Number of Products You Want To Buy :- ")
        n = int(input())
        print("Enter Data As Follows :- ")
          
        if user_id not in user_data.keys():
            user_data[user_id] = {}
            g = 0
        else:
            g = int(list(user_data[user_id].keys())[-1])+1
              
        for i in range(n):
            print("Enter Product ID of Product " +
                  str(i+1)+" that you want to buy")
            id = input()
              
            if id in data.keys():
                user_data[user_id][str(i+1+g)] = {}
                user_data[user_id][str(i+1+g)]['time_date'] = str(time.ctime())
                time_date.append(str(time.ctime()))
                if(float(data[id]['quantity']) == 0):
                    print("Product You Want is Currenty Out Of Stock...!!!")
                    continue
                      
                purchase_no.append(i+1+g)
                name.append(data[id]['name'])
                user_data[user_id][str(i+1+g)]['name'] = data[id]['name']
                prod_id.append(id)
                user_data[user_id][str(i+1+g)]['product_id'] = id
                category.append(data[id]['category'])
                user_data[user_id][str(
                    i+1+g)]['category'] = data[id]['category']
                print("For Product "+str(data[id]['name']) +
                      " Available Quantity is :- "+str(data[id]['quantity']))
                print("Enter Quantity of Product " +
                      str(i+1)+" that you want to buy")
                quantity = input()
                  
                if (float(quantity) <= float(data[id]['quantity'])):
                    data[id]['quantity'] = str(
                        float(data[id]['quantity'])-float(quantity))
                    quantity_all.append(quantity)
                    user_data[user_id][str(i+1+g)]['quantity'] = str(quantity)
                    price.append(data[id]['price'])
                    user_data[user_id][str(i+1+g)]['price'] = data[id]['price']
                    user_data[user_id][str(
                        i+1+g)]['Transaction ID'] = str(transaction_id)
                else:
                    print(
                        "The Quantity You Have Asked is Quite High\
                        Than That is Avaiable in Stock")
                    print(
                        "Did you Want To buy According to The Quantity\
                        Available in Stock then Enter '0' Else '1'\
                        to skip This Product")
                    key = int(input())
                      
                    if (key == 0):
                        print("Enter Quantity of Product " +
                              str(i+1)+" that you want to buy")
                        quantity = intput()
                        if (float(quantity) <= float(data[id]['quantity'])):
                            data[id]['quantity'] = str(
                                float(data[id]['quantity'])-float(quantity))
                            quantity_all.append(quantity)
                            user_data[user_id][str(
                                i+1)]['quantity'] = str(quantity)
                            price.append(data[id]['price'])
                            user_data[user_id][str(
                                i+1)]['price'] = data[id]['price']
                            user_data[user_id][str(
                                i+1+g)]['Transaction ID'] = str(transaction_id)
                        else:
                            print("Invalid Operation Got Repeated...!!!")
                    elif (key == 1):
                        continue
                    else:
                        print("Invalid Choice...!!!")
            else:
                print("Invalid Product ID...!!!")
        if(len(purchase_no) != 0):
            generate_bill(user_id, prod_id, price, time_date, purchase_no,
                          name, category, quantity_all, transaction_id)
    else:
        print("User ID Doesn't Exists...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
    js = json.dumps(user_data)
    fd = open("user_data.json", 'w')
    fd.write(js)
    fd.close()

毕竟，我们必须管理用户和管理员级别的功能。所以，代码是，

蟒蛇3

import json
import pandas as pd
  
while (1):
    print("Choose Any One of The Following :- ")
    print("1)Admin")
    print("2)User")
    print("3)Exit")
    print("Enter Your Choice Here :- ")
    n = int(input())
    if (n == 1):
        admin()
    elif (n == 2):
        user()
    elif (n == 3):
        break
    else:
        print("Invalid Choice...!!!")

这是具有管理员和用户功能的完整库存管理系统。

下面是完整的实现：

蟒蛇3

import pandas as pd
import json
import os.path
import time
import random
    
# Creating Dictionary to store data
available_products = {1001: {"name": "avacado", "price": 230,
                             "category": "grocery",
                             "quantity": 10, "date": "10/03/2021"},
                      1002: {"name": "lotion", "price": 250,
                             "category": "beauty & personal",
                             "quantity": 100,
                             "date": "15/07/2021"},
                      1003: {"name": "pain reliever", "price": 500,
                             "category": "health",
                             "quantity": 200, "date": "12/04/2021"},
                      1004: {"name": "dry pasta", "price": 20,
                             "category": "grocery",
                             "quantity": 50, "date": "27/06/2021"},
                      1005: {"name": "toothbrush", "price": 700,
                             "category": "beauty & personal",
                             "quantity": 100,
                             "date": "30/01/2021"},
                      1006: {"name": "halloween candy", "price": 33,
                             "category": "grocery",
                             "quantity": 56, "date": "22/02/2021"},
                      1007: {"name": "mascara", "price": 765,
                             "category": "beauty & personal", 
                             "quantity": 70,
                             "date": "11/03/2021"},
                      1008: {"name": "capsicum", "price": 764, 
                             "category": "grocery",
                             "quantity": 90, "date": "16/02/2021"},
                      1009: {"name": "blush", "price": 87,
                             "category": "beauty & personal",
                             "quantity": 50, "date": "17/07/2021"},
                      1010: {"name": "granola bars", "price": 24,
                             "category": "grocery", "quantity": 60,
                             "date": "20/05/2021"},
                      }
  
# Formatting Dictionary into JSON format
js = json.dumps(available_products)
  
#  json.dumps() function converts a
# Python object into a json string
js  # so we got all data in json string format here
  
# Create Jason File for DataBase and Write data Into File
fd = open("data.json", 'w')
# it will open file into write mode if file 
# does not exists then it will create file too'''
fd.write(js)  # writing string into file
fd.close()  # Close File After Inserting Data
  
def admin():
    print("========\
    Welcome to the Admin Inventory Management System \
    ==============")
    while (1):
        print("1)Display DataBase/All Products with there details")
        print("2)Display Specific Product with its details")
        print("3)Insert Data Into DataBase")
        print("4)Update Product in Database")
        print("5)Delete Product in DataBase")
        print("6)Display User Purchase Reports")
        print("7)Exit")
        print("Enter Your Choice :- ")
        n = int(input())
        if (n == 1):
            display_data()
        elif (n == 2):
            display_specific_data()
        elif (n == 3):
            add_new()
        elif (n == 4):
            update_prod_data()
        elif (n == 5):
            delete_prod()
        elif (n == 6):
            display_reports_admin()
        elif (n == 7):
            break
        else:
            print("Invalid Choice...!!!")
  
  
def display_data():
  
    fd = open("data.json", 'r') 
    txt = fd.read()  # reading data from file
    data = json.loads(txt)
      
    # This will parse the JSON data, populates a 
    # Python dictionary with the data
    fd.close()
    print("Enter '0' To Display Data Category Wise or '1' \
    To Show Data As its Sequence Of Insertion :- ")
    n = int(input())
      
    # Display All Records
    if (n == 1):
        table = pd.DataFrame(
            columns=['ID', 'name', 'price', 'category', 'quantity', 'date'])
          
        # Creating Pandas dataframe to show data in table format later
        for i in data.keys():
            
            # Fetch all keys in dictionary
            temp = pd.DataFrame(columns=['ID'])
            temp['ID'] = [i]
            for j in data[i].keys():
                temp[j] = [data[i][j]]
            table = table.append(temp)
        table = table.reset_index(drop=True)
        '''This will reset index of dataframe'''
        from IPython.display import display
        display(table)
          
    elif (n == 0):
        
        # Display Records by Category
        table = pd.DataFrame(
            columns=['ID', 'name', 'price', 'category',
                     'quantity', 'date'])
        cat = []
          
        for i in data.keys():
            temp = pd.DataFrame(columns=['ID'])
            temp['ID'] = [i]
            for j in data[i].keys():
                temp[j] = [data[i][j]]
                if (j == 'category'):
                    cat.append(data[i][j])
            table = table.append(temp)
            table = table.reset_index(drop=True)
            cat = set(cat)
            cat = list(cat)
              
        for k in cat:
            temp = pd.DataFrame()
            temp = table[table['category'] == k]
            print("Data Of Products Of Category "+k+" is:- ")
            from IPython.display import display
            display(temp)
    else:
        print("Enter Valid Choice...!!!")
          
# display_data() # Uncomment This Line To Run This Function
def display_specific_data():
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter Product ID Whoes Details You Want to Have a Look on :- ")
    i = input()
      
    # Follwing Code will Filter out Product ID from Records
    if i in data.keys():
        temp = pd.DataFrame(columns=['ID'])
        temp['ID'] = [i]
        for j in data[i].keys():
            temp[j] = [data[i][j]]
        from IPython.display import display
        display(temp)
    else:
        print("You Have Entered Wrong Product ID\
        that is not Present in DataBase...!!!")
  
  
# display_specific_data() # Uncomment This Line To Run This Function
def add_new():
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter New Product ID :- ")
    id = input()
      
    if id not in data.keys():
        print("Enter Product Name :- ")
        name = input()
        print("Enter Price of Product(price for product quantity as 1) :- ")
        price = input()
        print("Enter Category of Product :- ")
        category = input()
        print("Enter Quantity of Product :- ")
        quantity = input()
        print("Enter The Date on Which Product is Added in Inventory :- ")
        date = input()
        data[id] = {'name': name, 'price': price,
                    'category': category, 'quantity': quantity, 'date': date}
        print("Please Press '0' to Add New\
        Attributes/Properties of Product or Press '1' to Continue :- ")
        z = int(input())
        if(z == 0):
            print("Enter Number of New Attributes/Properties of Product :- ")
            n = int(input())
            for i in range(n):
                print("Enter Attribute Name That you Want To Add :- ")
                nam = input()
                print("Enter The "+str(nam)+" of Product :- ")
                pro = input()
                data[id][nam] = pro
        print("Product ID "+str(id)+" Added Successfully...!!!")
    else:
        print("The Product ID you Have Entered Is\
        Already Present in DataBase Please Check...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
      
# add_new() # Uncomment This Line To Run This Function
def delete_prod():
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter The Product ID of The Product Which You Want To Delete :- ")
    temp = input()
    if temp in data.keys():
        data.pop(temp)  # here we are removing that particular data
        print("Product ID "+str(temp)+" Deleted Successfully...!!!")
    else:
        print("Invalid Product ID...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
      
# delete_prod() # Uncomment This Line To Run This Function
def update_prod_data():
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter The Product ID of The Product\
    Which You Want To Update :- ")
    temp = input()
      
    if temp in data.keys():
        print("Want to update whole product data\
        press '0' else '1' for specific data :- ")
        q = int(input())
          
        if (q == 0):
            print("Enter Product Name :- ")
            name = input()
            print("Enter Price of Product(price for\
            product quantity as 1) :- ")
            price = input()
            print("Enter Category of Product :- ")
            category = input()
            print("Enter Quantity of Product :- ")
            quantity = input()
            print("Enter The Date on Which Product\
            is Added in Inventory :- ")
            date = input()
            data[temp] = {'name': name, 'price': price,
                          'category': category, 'quantity': quantity, 
                          'date': date}
            print(
                "Please Press '0' to Add more Attributes/Properties of Product or Press '1' to Continue :- ")
            z = int(input())
              
            if(z == 0):
                print("Enter Number of New Attributes/Properties of Product :- ")
                n = int(input())
                for i in range(n):
                    print("Enter Attribute Name That you Want To Add :- ")
                    nam = input()
                    print("Enter The "+str(nam)+" of Product :- ")
                    pro = input()
                    data[temp][nam] = pro
            print("Product ID "+str(temp)+" Updated Successfully...!!!")
              
        elif(q == 1):
            print("Enter Which Attribute of Product You want to Update :- ")
            p = input()
              
            if p in data[temp].keys():
                print("Enter "+str(p)+" of Product :- ")
                u = input()
                data[temp][p] = u
                print("Product ID "+str(temp)+"'s attribute " +
                      str(p)+" is Updated Successfully...!!!")
            else:
                print("Invalid Product Attribute...!!!")
        else:
            print("Invalid Choice...!!!")
    else:
        print("Invalid Product ID...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
      
# update_prod_data() # Uncomment This Line To Run This Function
def display_reports_admin():
    if (os.path.isfile("user_data.json") is False):
        # Check for if file is present or not
        # File will be generated only if any user will do some purchase
        print("No User Reports are Present")
        return
    fd = open("user_data.json", 'r')
    txt = fd.read()
    user_data = json.loads(txt)
    fd.close()
    print("Enter '0' to Check All Bills/Reports\
    and '1' To Check Specific User Bills/Reports :- ")
    n = int(input())
    if (n == 1):
        print("Enter User ID Whoes Details You Want to Have a Look on")
        i = input()
        temp = pd.DataFrame()
        if i in user_data.keys():
            for j in user_data[i].keys():
                d = dict()
                d['User ID'] = i
                d['Purchase Number'] = j
                for k in user_data[i][j].keys():
                    d[k] = user_data[i][j][k]
                temp = temp.append(d, ignore_index=True)
                d = dict()
            temp = temp.reset_index(drop=True)
            from IPython.display import display
            display(temp)
        else:
            print("You Have Entered Wrong User ID that is not Present in DataBase...!!!")
    elif (n == 0):
        table = pd.DataFrame()
        for i in user_data.keys():
            temp = pd.DataFrame()
            for j in user_data[i].keys():
                d = dict()
                d['User ID'] = i
                d['Purchase Number'] = j
                for k in user_data[i][j].keys():
                    d[k] = user_data[i][j][k]
                temp = temp.append(d, ignore_index=True)
                d = dict()
            table = table.append(temp)
        table = table.reset_index(drop=True)
        from IPython.display import display
        display(table)
    else:
        print("Please Enter Valid Choice...!!!")
  
# display_reports_admin() # Uncomment This Line To Run This Function
def delete_all():
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    data = {}  # Replacing Data with NULL Dictionary
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
  
  
def user():
    print("======= Welcome to the User Inventory Management System ====")
    while (1):
        print("1)Display All Products With Deatils")
        print("2)Display Specific Product With Deatils")
        print("3)Display All Purchase Bills")
        print("4)Buy The Product")
        print("5)Exit")
        print("Enter Your Choice :- ")
        n = int(input())
        if (n == 1):
            display_data()
        elif (n == 2):
            display_specific_data()
        elif (n == 3):
            display_user_data()
        elif (n == 4):
            buy_product()
        elif (n == 5):
            break
        else:
            print("Invalid Choice...!!!")
  
  
def display_user_data():
  
    if (os.path.isfile("user_data.json") is False):
        print("No User Reports are Present")
        return
    fd = open("user_data.json", 'r')
    txt = fd.read()
    user_data = json.loads(txt)
    fd.close()
    print("Enter your User ID to Display All your Bills :- ")
    i = input()
    temp = pd.DataFrame()
      
    if i in user_data.keys():
        for j in user_data[i].keys():
            d = dict()
            d['User ID'] = i
            d['Purchase Number'] = j
            for k in user_data[i][j].keys():
                d[k] = user_data[i][j][k]
            temp = temp.append(d, ignore_index=True)
            d = dict()
        temp = temp.reset_index(drop=True)
        from IPython.display import display
        display(temp)
    else:
        print("You Have Entered Wrong User ID that is not Present in DataBase...!!!")
  
  
def generate_bill(user_id, prod_id, price, time_date, purchase_no, 
                  name, category, quantity_all, transaction_id):
    print("========= Bill ========")
    print("#######################")
    print("   User ID :-", user_id)
    print("#################")
    amount = 0
    n = len(purchase_no)
      
    for i in range(n):
        print("-----------------------------------------")
        amount = amount+float(price[i])*float(quantity_all[i])
        print("Purchase number", purchase_no[i],
              "\nPurchase Time :-", time_date[i], "\nProduct ID :-", 
              prod_id[i], "\nName Of Product :-",
              name[i], "\nCategory Of Product :-", category[i],
              "\nPrice of Product per Item :-", price[i], 
              "\nPurchase Quantity :-", quantity_all[i])
        print("-----------------------------------")
    print("*****************************************")
    print("   Total Payable Bill :-",
          amount, "Transaction ID :-", transaction_id)
    print("***************************************")
  
  
def buy_product():
      
    if (os.path.isfile("user_data.json") is False):
        user_data = {}
    else:
        fd = open("user_data.json", 'r')
        txt = fd.read()
        user_data = json.loads(txt)
        fd.close()
    fd = open("data.json", 'r')
    txt = fd.read()
    data = json.loads(txt)
    fd.close()
    print("Enter Your User ID if You are Old \
    Customer else press '0' To New User ID :- ")
    p = int(input())
    if (p == 0):
        if (len(user_data.keys()) == 0):
            user_id = 1000
        else:
            user_id = int(list(user_data.keys())[-1])+1
    else:
        if str(p) in user_data.keys():
            user_id = p
        else:
            user_id = -1
    if (user_id != -1):
        user_id = str(user_id)
        price = []
        time_date = []
        purchase_no = []
        name = []
        category = []
        quantity_all = []
        prod_id = []
        transaction_id = ''.join(random.choice(
            '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ') for i in range(10))
        print("Enter Number of Products You Want To Buy :- ")
        n = int(input())
        print("Enter Data As Follows :- ")
        if user_id not in user_data.keys():
            user_data[user_id] = {}
            g = 0
        else:
            g = int(list(user_data[user_id].keys())[-1])+1
        for i in range(n):
            print("Enter Product ID of Product " +
                  str(i+1)+" that you want to buy")
            id = input()
            if id in data.keys():
                user_data[user_id][str(i+1+g)] = {}
                user_data[user_id][str(i+1+g)]['time_date'] = str(time.ctime())
                time_date.append(str(time.ctime()))
                if(float(data[id]['quantity']) == 0.0):
                    print("Product You Want is Currenty Out Of Stock...!!!")
                    continue
                purchase_no.append(i+1+g)
                name.append(data[id]['name'])
                user_data[user_id][str(i+1+g)]['name'] = data[id]['name']
                prod_id.append(id)
                user_data[user_id][str(i+1+g)]['product_id'] = id
                category.append(data[id]['category'])
                user_data[user_id][str(
                    i+1+g)]['category'] = data[id]['category']
                print("For Product "+str(data[id]['name']) +
                      " Available Quantity is :- "+str(data[id]['quantity']))
                print("Enter Quantity of Product " +
                      str(i+1)+" that you want to buy")
                quantity = input()
                if (float(quantity) <= float(data[id]['quantity'])):
                    data[id]['quantity'] = str(
                        float(data[id]['quantity'])-float(quantity))
                    quantity_all.append(quantity)
                    user_data[user_id][str(i+1+g)]['quantity'] = str(quantity)
                    price.append(data[id]['price'])
                    user_data[user_id][str(i+1+g)]['price'] = data[id]['price']
                    user_data[user_id][str(
                        i+1+g)]['Transaction ID'] = str(transaction_id)
                else:
                    print(
                        "The Quantity You Have Asked is Quite High Than\
                        That is Avaiable in Stock")
                    print(
                        "Did you Want To buy According to The Quantity\
                        Available in Stock then Enter '0' Else '1'\
                        to skip This Product")
                    key = int(input())
                    if (key == 0):
                        print("Enter Quantity of Product " +
                              str(i+1)+" that you want to buy")
                        quantity = intput()
                        if (float(quantity) <= float(data[id]['quantity'])):
                            data[id]['quantity'] = str(
                                float(data[id]['quantity'])-float(quantity))
                            quantity_all.append(quantity)
                            user_data[user_id][str(
                                i+1)]['quantity'] = str(quantity)
                            price.append(data[id]['price'])
                            user_data[user_id][str(
                                i+1)]['price'] = data[id]['price']
                            user_data[user_id][str(
                                i+1+g)]['Transaction ID'] = str(transaction_id)
                        else:
                            print("Invalid Operation Got Repeated...!!!")
                    elif (key == 1):
                        continue
                    else:
                        print("Invalid Choice...!!!")
            else:
                print("Invalid Product ID...!!!")
        if(len(purchase_no) != 0):
            generate_bill(user_id, prod_id, price, time_date, purchase_no,
                          name, category, quantity_all, transaction_id)
    else:
        print("User ID Doesn't Exists...!!!")
    js = json.dumps(data)
    fd = open("data.json", 'w')
    fd.write(js)
    fd.close()
    js = json.dumps(user_data)
    fd = open("user_data.json", 'w')
    fd.write(js)
    fd.close()
  
  
while (1):
    print("Choose Any One of The Following :- ")
    print("1)Admin")
    print("2)User")
    print("3)Exit")
    print("Enter Your Choice Here :- ")
    n = int(input())
    if (n == 1):
        admin()
    elif (n == 2):
        user()
    elif (n == 3):
        break
    else:
        print("Invalid Choice...!!!")

输出：