Add comprehensive data engineering learning path with Python and SQL curriculum

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# Virtual environments
+venv/
+env/
+ENV/
+env.bak/
+venv.bak/
+.venv/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Jupyter Notebook
+.ipynb_checkpoints
+*.ipynb_checkpoints/
+
+# Database files
+*.db
+*.sqlite
+*.sqlite3
+etl_output.db
+
+# Data files (optional - uncomment if you don't want to track data files)
+# *.csv
+# *.json
+# *.xlsx
+# *.parquet
+
+# Logs
+*.log
+logs/
+
+# Environment variables
+.env
+.env.local
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+
+# OS
+Thumbs.db
+.DS_Store
+
+# Temporary files
+tmp/
+temp/
+*.tmp

01-python-fundamentals/README.md

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+# Python Fundamentals
+
+Welcome to the Python Fundamentals section! This is where your journey begins.
+
+## 📚 What You'll Learn
+
+- Python syntax and basic data types
+- Control structures (if, for, while)
+- Functions and modules
+- Object-oriented programming basics
+- Error handling
+- File operations
+
+## 📖 Lessons
+
+1. [Getting Started with Python](lessons/01-getting-started.md)
+2. [Variables and Data Types](lessons/02-variables-datatypes.md)
+3. [Control Flow](lessons/03-control-flow.md)
+4. [Functions](lessons/04-functions.md)
+5. [Object-Oriented Programming](lessons/05-oop-basics.md)
+6. [Error Handling](lessons/06-error-handling.md)
+7. [File I/O](lessons/07-file-io.md)
+
+## 💻 Examples
+
+Check the `examples/` folder for working code examples that demonstrate each concept.
+
+## ✏️ Exercises
+
+Complete the exercises in the `exercises/` folder to practice what you've learned. Solutions are provided, but try to solve them on your own first!
+
+## ⏱️ Estimated Time
+
+2-4 weeks, depending on your prior programming experience and time commitment.
+
+## ✅ Completion Checklist
+
+- [ ] Complete all lessons
+- [ ] Run all examples
+- [ ] Solve all exercises
+- [ ] Build a small project using concepts learned
+
+## 🎯 Project Idea
+
+Build a simple command-line todo list application that:
+- Adds tasks
+- Removes tasks
+- Marks tasks as complete
+- Saves tasks to a file
+- Loads tasks from a file
+
+## 📚 Additional Resources
+
+- [Python Official Tutorial](https://docs.python.org/3/tutorial/)
+- [Real Python - Python Basics](https://realpython.com/tutorials/basics/)
+- [Automate the Boring Stuff with Python](https://automatetheboringstuff.com/)

01-python-fundamentals/examples/hello_world.py

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+"""
+Basic Python Examples - Hello World and Simple Operations
+"""
+
+# Simple print statement
+print("Hello, Data Engineer!")
+
+# Print with multiple values
+print("Welcome to", "Python", "Programming")
+
+# Basic arithmetic
+print("\n=== Basic Arithmetic ===")
+print("2 + 3 =", 2 + 3)
+print("10 - 4 =", 10 - 4)
+print("5 * 6 =", 5 * 6)
+print("20 / 4 =", 20 / 4)
+print("17 // 5 =", 17 // 5)  # Integer division
+print("17 % 5 =", 17 % 5)    # Modulus
+print("2 ** 8 =", 2 ** 8)    # Exponentiation
+
+# String operations
+print("\n=== String Operations ===")
+name = "Data Engineer"
+print("Hello,", name)
+print("Length of name:", len(name))
+print("Uppercase:", name.upper())
+print("Lowercase:", name.lower())
+
+# Comments
+# This is a single-line comment
+"""
+This is a multi-line comment
+or a docstring
+"""