🧑‍💼 Employee Management System (Python)

A modular and file-based Employee Management System built using Python, demonstrating core programming concepts like:

• File Handling using pickle
• Modular Programming
• Custom Exception Handling
• Input Validation
• CRUD Operations (Create, Read, Update, Delete)

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⚙️ Features

Feature	Description
➕ Add Employee	Add new employee with ID, Name, Salary, Company
🗑️ Delete Employee	Delete employee record by ID
✏️ Update Employee	Update Salary and Company of existing employee
👁️ View Employee	View a single employee record by ID
📋 View All Employees	Display all stored employee records
🔍 Search Employee	Search and verify employee by ID
✅ Name Validation	Custom validation for employee and company names
🚨 Custom Exceptions	Handles zero length, spaces, and invalid name errors

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🛠️ Technologies Used

• Python
• File Handling (pickle)
• Custom Exception Handling
• Modular Programming

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📁 Project Structure

Employee-Management-System/
│
├── File System/
|   └── File.txt
|
├── EmployeeMenu.py               # Menu UI
├── EmployeeAdd.py                # Add employee
├── EmployeeDelete.py             # Delete employee
├── EmployeeUpdate.py             # Update employee
├── EmployeeView.py               # View employee(s)
├── EmployeeSearch.py             # Search employee
├── EmployeeMainFile.py        # Main entry point
│
└── NameValidation/            # Validation package
    ├── NameValidException.py
    └── NameValidateOperation.py

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🧩 Modules Overview

EmployeeMainFile.py

• Entry point of the application
• Uses match-case (Python 3.10+) for menu-driven control flow
• Imports all modules and calls respective functions

EmployeeMenu.py

• Contains menu() function
• Displays the main menu to the user

EmployeeAdd.py

• is_unique(employee) — checks if employee ID already exists
• add_employee() — collects data, validates, and saves using pickle

EmployeeDelete.py

• delete_employee() — finds and removes employee record by ID

EmployeeUpdate.py

• update_employee() — updates Salary and Company of an employee

EmployeeView.py

• view_employee() — displays a single employee's details
• view_all_employee() — displays all employee records in table format

EmployeeSearch.py

• search_employee() — searches for an employee by ID and confirms existence

Emp&CompNameValidation/ (Package)

• NameValidException.py — defines 3 custom exceptions:
  • ZeroNameLengthError — raised when name is empty
  • SpaceError — raised when name contains only spaces
  • InvalidNameError — raised when name has numbers/symbols
• NameValidateOperation.py — contains name_validate() function that validates employee and company names using above exceptions

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🗃️ Data Storage

• Records are stored in Employee.info binary file
• Uses Python's pickle module for serialization
• Each record is stored as a dictionary:

```python { "ID" : 101, "Name" : "Rahul Kumar", "Salary" : 50000.00, "Company": "TechCorp" } ```

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▶️ How to Run

1. Clone the repository ```bash git clone https://github.com/Biswojit02/employee-information-system.git cd employee-information-system ```

2. Update the path in EmployeeAdd.py and EmployeeUpdate.py ```python sys.path.append("your/local/path/to/Emp&CompNameValidation") ```

3. Run the main program ```bash python EmployeeMainFile.py ```

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📋 Requirements

• Python 3.10+ (for match-case support)
• No external libraries required
• Uses only built-in modules: pickle, sys

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💡 How It Works

• Employee data is stored in a binary file: Employee.info
• Uses pickle to serialize and deserialize Python objects
• Each employee record is stored as a dictionary
• File is read using loop until EOFError

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🧠 Key Concepts Demonstrated

• Python File Handling
• Exception Handling (Built-in + Custom)
• Data Validation
• Looping & Control Flow
• Modular Code Design

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⚠️ Error Handling

• Invalid ID input (non-numeric)
• File not found
• Invalid name (empty, spaces, special characters)

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🔥 Future Improvements

• Add GUI (Tkinter / Web App)
• Use Database (SQLite / MySQL)
• Add Login System
• Export data to CSV/Excel
• Auto-generate Employee IDs

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🤝 Contributing

Contributions are welcome! Feel free to fork this repo and submit a pull request.

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📜 License

This project is licensed under the MIT License.
Feel free to use, modify, and distribute.

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