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20 hours ago •
Pankaj-Str
Pankaj-Str
Assignment: E-commerce-like Advanced Billing System using Python
Objective:
Create an advanced billing system for an e-commerce application that allows users to input product details, apply GST, select discount offers, remove products, and calculate the final bill. The system should provide a detailed invoice with a breakdown of each item, taxes, discounts, and the total amount in Indian Rupees (₹).
Requirements:
-
Product Input:
- Allow the user to input multiple product details including:
- Product ID
- Product Name
- Quantity
- Unit Price (in ₹)
- Allow the user to input multiple product details including:
-
GST Calculation:
- Apply GST (Goods and Services Tax) to each product. GST rates should be variable and user-defined (e.g., 5%, 12%, 18%, 28%).
-
Discount Offers:
- Allow the user to select from various discount offers:
- Percentage Discount on the total bill (e.g., 5%, 10%, 15%)
- Fixed Amount Discount on the total bill (e.g., ₹100, ₹200)
- Discount on specific products (e.g., 10% off on Product A)
- Allow the user to select from various discount offers:
-
Product Removal:
- Allow the user to remove products from the list by entering the Product ID.
-
View Products:
- Allow the user to view all products added to the bill with their details.
-
Invoice Generation:
- Generate a detailed invoice including:
- Product details (Product ID, Name, Quantity, Unit Price, Subtotal)
- GST applied
- Discounts applied
- Total amount before and after tax and discounts
- Generate a detailed invoice including:
-
User Interface:
- Create a simple text-based menu-driven interface to interact with the system.
- Provide options to:
- Add a new product
- View all products
- Remove a product
- Apply GST
- Apply Discounts
- Generate and view the final invoice
-
Data Validation:
- Ensure data validation for user inputs (e.g., numeric values for prices and quantities, valid GST rates).
Example Workflow:
-
Add Products:
Enter Product ID: 101 Enter Product Name: Laptop Enter Quantity: 2 Enter Unit Price (₹): 75000 Enter Product ID: 102 Enter Product Name: Mouse Enter Quantity: 5 Enter Unit Price (₹): 500 -
View Products:
----------------------------------- Products List: ----------------------------------- Product ID: 101, Product Name: Laptop, Quantity: 2, Unit Price (₹): 75000 Product ID: 102, Product Name: Mouse, Quantity: 5, Unit Price (₹): 500 -
Remove Product:
Enter Product ID to remove: 102 -
Apply GST:
Enter GST rate (%): 18 -
Apply Discounts:
Select Discount Type: 1. Percentage Discount on Total Bill 2. Fixed Amount Discount on Total Bill 3. Discount on Specific Product Enter Choice: 1 Enter Discount Rate (%): 10 -
Generate Invoice:
----------------------------------- E-commerce Billing System Invoice ----------------------------------- Product ID: 101 Product Name: Laptop Quantity: 2 Unit Price (₹): 75000 Subtotal (₹): 150000 GST @ 18% (₹): 27000 ----------------------------------- Total before discount (₹): 177000 Discount @ 10% (₹): 17700 ----------------------------------- Final Total (₹): 159300 -----------------------------------
Submission:
Submit the Python script implementing the advanced billing system. Ensure your code is well-documented with comments explaining each part of the logic. Include a README file explaining how to run your program and any dependencies required.
Evaluation Criteria:
- Correctness and completeness of the implemented features
- Code readability and documentation
- Handling of edge cases and data validation
- User interface and user experience
productID = []
productName = []
quantity = []
unitPrice = []
option = 1
gst = 0
val = 0
discount = 0
switchOption = int(input("Enter 1. To add new product\n 2. To view all products\n 3. To remove a product\n 4. To apply GST\n 5. To apply discounts\n 6. To generate and view the final invoice\n"))
while(switchOption != 0):
if(switchOption == 1):
prodID = input("Enter Product ID: ")
productID.append(prodID)
prodName = input("Enter Product Name: ")
productName.append(prodName)
quanti = int(input("Enter Quantity: "))
quantity.append(quanti)
uniPrice = int(input("Enter Unit Price (Rs): "))
unitPrice.append(uniPrice)
switchOption = int(input("Enter 1. To add new product\n 2. To view all products\n 3. To remove a product\n 4. To apply GST\n 5. To apply discounts\n 6. To generate and view the final invoice\n"))
elif(switchOption == 2):
print("-----------------------------------")
print("Products List:")
print("-----------------------------------")
for i in range(0, len(productID)):
print(f"Product ID: {productID[i]}, Product Name: {productName[i]}, Quantity: {quantity[i]} + Unit Price (Rs): {unitPrice[i]}")
switchOption = int(input("Enter 1. To add new product\n 2. To view all products\n 3. To remove a product\n 4. To apply GST\n 5. To apply discounts\n 6. To generate and view the final invoice\n"))
elif(switchOption == 3):
prodID = input("Enter Product ID to remove: ")
index = 0
for i in range(0, len(productID)):
if(productID[i] == prodID):
index = i
num = productID.pop(index)
num = productName.pop(index)
num = quantity.pop(index)
num = unitPrice.pop(index)
switchOption = int(input("Enter 1. To add new product\n 2. To view all products\n 3. To remove a product\n 4. To apply GST\n 5. To apply discounts\n 6. To generate and view the final invoice\n"))
elif(switchOption == 4):
gst = int(input("Enter GST rate (%): "))
switchOption = int(input("Enter 1. To add new product\n 2. To view all products\n 3. To remove a product\n 4. To apply GST\n 5. To apply discounts\n 6. To generate and view the final invoice\n"))
elif(switchOption == 5):
rate = 0
discount = 0
print("Select Discount Type:\n 1. Percentage Discount on Total Bill\n 2. Fixed Amount Discount on Total Bill\n 3. Discount on Specific Product\n")
val = int(input("Enter choice: "))
if(val == 1):
rate = int(input("Enter Discount Rate (%): "))
elif(val == 2):
discount = int(input("Enter the fixed amount discount on total bill: "))
elif(val == 3):
for i in range(0, len(productID)):
dis = int(input(f"Enter the discount for productID {productID[i]}: "))
unitPrice[i] = unitPrice[i] - (unitPrice[i] * dis / 100)
switchOption = int(input("Enter 1. To add new product\n 2. To view all products\n 3. To remove a product\n 4. To apply GST\n 5. To apply discounts\n 6. To generate and view the final invoice\n"))
elif(switchOption == 6):
print("-----------------------------------")
print("E-commerce Billing System Invoice")
print("-----------------------------------")
subtotal = 0
for i in range(0, len(productID)):
print(f"Product ID: {productID[i]}")
print(f"Product Name: {productName[i]}")
print(f"Quantity: {quantity[i]}")
print(f"Unit Price (Rs): {unitPrice[i]}")
subtotal = subtotal + quantity[i] * unitPrice[i]
print(f"Subtotal (Rs): {subtotal}")
print(f"GST @ {gst}% (Rs): {(gst*subtotal/100)}")
print("-----------------------------------")
print(f"Total before discount (₹): {(subtotal + gst*subtotal/100)}")
if(val == 1):
print(f"Discount @ {rate}% (Rs): {rate*(subtotal + gst*subtotal/100)/100}")
print("-----------------------------------")
finalTotal = (subtotal + gst*subtotal/100) - ((rate*(subtotal + gst*subtotal/100)/100))
print(f"Final Total (₹): {finalTotal}")
print("-----------------------------------")
elif(val == 2):
print(f"Discount is {discount}")
print("-----------------------------------")
finalTotal = (subtotal + gst*subtotal/100) - discount
print(f"Final Total (₹): {finalTotal}")
print("-----------------------------------")
elif(val == 3):
print("-----------------------------------")
finalTotal = (subtotal + gst*subtotal/100)
print(f"Final Total (₹): {finalTotal}")
print("-----------------------------------")
switchOption = 0
products = {} # Dictionary to store product details with Product ID as key
total_discount = 0 # Variable to store total discount applied
def add_product():
"""Function to add a new product to the billing system"""
try:
product_id = input("Enter Product ID: ")
if product_id in products:
print("Product ID already exists! Try updating the quantity instead.\n")
return
name = input("Enter Product Name: ")
quantity = int(input("Enter Quantity: "))
unit_price = float(input("Enter Unit Price (₹): "))
products[product_id] = {
"name": name,
"quantity": quantity,
"unit_price": unit_price,
"gst_rate": 0,
"discount": 0
}
print("Product added successfully!\n")
except ValueError:
print("Invalid input! Please enter numeric values for quantity and unit price.\n")
def view_products():
"""Function to display all added products"""
if not products:
print("No products added yet.\n")
return
print("Product List:")
for product_id, details in products.items():
print(f"ID: {product_id}, Name: {details['name']}, Quantity: {details['quantity']}, Price (₹): {details['unit_price']}")
print()
def remove_product():
"""Function to remove a product from the billing system"""
product_id = input("Enter Product ID to remove: ")
if product_id in products:
del products[product_id]
print("Product removed successfully!\n")
else:
print("Product ID not found!\n")
def apply_gst():
"""Function to apply GST to all products"""
try:
gst_rate = float(input("Enter GST rate (%): "))
if 0 <= gst_rate <= 100:
for product in products.values():
product["gst_rate"] = gst_rate
print(f"GST of {gst_rate}% applied to all products.\n")
else:
print("Invalid GST rate! It must be between 0 and 100.\n")
except ValueError:
print("Invalid input! Please enter a numeric GST rate.\n")
def apply_discount():
"""Function to apply discount on total bill or specific products"""
global total_discount
try:
print("Select Discount Type:")
print("1. Percentage Discount on Total Bill")
print("2. Fixed Amount Discount on Total Bill")
print("3. Discount on Specific Product")
choice = int(input("Enter Choice: "))
if choice == 1:
total_discount = float(input("Enter Discount Rate (%): "))
elif choice == 2:
total_discount = float(input("Enter Discount Amount: "))
elif choice == 3:
product_id = input("Enter Product ID for Discount: ")
if product_id in products:
discount_rate = float(input("Enter Discount Rate (%): "))
products[product_id]["discount"] = discount_rate
print("Discount applied successfully!\n")
else:
print("Product not found!\n")
else:
print("Invalid choice!\n")
except ValueError:
print("Invalid input! Please enter numeric values where required.\n")
def generate_invoice():
"""Function to generate and display the final invoice"""
global total_discount
if not products:
print("No products added yet. Cannot generate invoice.\n")
return
print("-----------------------------------")
print("E-commerce Billing System Invoice")
print("-----------------------------------")
total_before_discount = 0
total_gst = 0
total_discount_amount = 0
for product_id, details in products.items():
subtotal = details['quantity'] * details['unit_price']
gst = (subtotal * details['gst_rate']) / 100
discount = (subtotal * details['discount']) / 100
total_before_discount += subtotal + gst
total_gst += gst
total_discount_amount += discount
print(f"Product ID: {product_id}")
print(f"Product Name: {details['name']}")
print(f"Quantity: {details['quantity']}")
print(f"Unit Price (₹): {details['unit_price']:.2f}")
print(f"Subtotal (₹): {subtotal:.2f}")
print(f"GST @ {details['gst_rate']}% (₹): {gst:.2f}")
if discount > 0:
print(f"Discount (₹): {discount:.2f}")
print("-----------------------------------")
if isinstance(total_discount, float) and total_discount > 0:
if total_discount <= 100:
discount_amount = (total_before_discount * total_discount) / 100
else:
discount_amount = total_discount
total_discount_amount += discount_amount
print(f"Total before discount (₹): {total_before_discount:.2f}")
print(f"Discount Applied (₹): {discount_amount:.2f}")
print("-----------------------------------")
final_total = total_before_discount - total_discount_amount
print(f"Final Total (₹): {final_total:.2f}")
print("-----------------------------------\n")
def main():
"""Main function to display menu and handle user input"""
while True:
print("1. Add New Product")
print("2. View All Products")
print("3. Remove Product")
print("4. Apply GST")
print("5. Apply Discounts")
print("6. Generate Invoice")
print("7. Exit")
choice = input("Enter your choice: ")
if choice == '1':
add_product()
elif choice == '2':
view_products()
elif choice == '3':
remove_product()
elif choice == '4':
apply_gst()
elif choice == '5':
apply_discount()
elif choice == '6':
generate_invoice()
elif choice == '7':
print("Exiting...\n")
break
else:
print("Invalid choice! Please try again.\n")
if __name__ == "__main__":
main()
