Assignment: Billing System Using File Handling in Python

[Pankaj-Str]

Objective:

The objective of this assignment is to develop a billing system that reads product details from a file, allows users to input purchase details, and generates a bill that is saved to a file. You will demonstrate your ability to perform file handling operations such as reading, writing, and appending data in Python.

Problem Statement:

You are required to create a Python program that performs the following tasks:

1. Read Product Details:

   • Read product details from a text file named products.txt. Each line in the file contains information about a product in the format: product_id,product_name,price.
   • Example content of products.txt:

     101,Apple,0.5
     102,Banana,0.3
     103,Orange,0.8
     104,Milk,1.2
     105,Bread,2.0
     

2. Input Purchase Details:

   • Allow the user to input the product ID and quantity for each item they want to purchase. Continue taking inputs until the user decides to stop.

3. Generate Bill:

   • Calculate the total cost for each item and the overall total bill.
   • Display the bill on the console and save it to a text file named bill.txt in the following format:

     BILL SUMMARY
     -----------------------------------
     Product ID: 101, Product Name: Apple, Quantity: 2, Unit Price: 0.5, Total: 1.0
     Product ID: 103, Product Name: Orange, Quantity: 1, Unit Price: 0.8, Total: 0.8
     -----------------------------------
     Total Bill: 1.8
     

4. Exception Handling:

   • Ensure proper exception handling for scenarios such as file not found, invalid product ID, and invalid input data.

Requirements:

• Use appropriate file handling methods for reading, writing, and appending data.
• Handle potential exceptions that might occur during file operations.
• Ensure the code is well-documented with comments explaining each step.

Submission:

Submit the Python script file named billing_system.py containing your solution, along with the products.txt file used for testing.

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Example:

Below is an example of how the products.txt file should look:

101,Apple,0.5
102,Banana,0.3
103,Orange,0.8
104,Milk,1.2
105,Bread,2.0

An example of the output in the bill.txt file after running the program could look like this:

BILL SUMMARY
-----------------------------------
Product ID: 101, Product Name: Apple, Quantity: 2, Unit Price: 0.5, Total: 1.0
Product ID: 103, Product Name: Orange, Quantity: 1, Unit Price: 0.8, Total: 0.8
-----------------------------------
Total Bill: 1.8

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This assignment will help you practice file handling operations and develop a functional billing system in Python. Good luck!