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How to Work with Alchemy and SQLite in Python- part 2

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In our first article we talked about starting simple with SQlite and then moving to rdbms databases such as Postgresql and then to cloud. In this article, you’ll learn how to build a simple trading database using SQLite and SQLAlchemy, understand what SQLAlchemy does, and see why this setup is especially useful for trading and investment systems.

What is SQLAlchemy?

SQLAlchemy is a powerful Python library that acts as a bridge between your Python code and a database.

Instead of writing raw SQL queries like:

SELECT * FROM trades WHERE profit > 0;

You can write:

session.query(Trade).filter(Trade.profit > 0).all()

Key Benefits

• Write database logic in Python instead of SQL
• Works with multiple databases (SQLite, PostgreSQL, MySQL)
• Cleaner, maintainable, and scalable code
• Easy migration from local → production systems

Why SQLite for Beginners?

SQLite is perfect for starting out:

• No installation required
• Stored as a single .db file