Python Coding challenge - Day 391| What is the output of the following Python Code?

 

Step-by-Step Explanation

1. Importing create_engine

from sqlalchemy import create_engine

create_engine is a function in SQLAlchemy that creates a database engine.

This engine serves as the core interface between Python and the database.

2. Creating an In-Memory SQLite Database

engine = create_engine("sqlite:///:memory:")

"sqlite:///:memory:" tells SQLite to create a temporary, in-memory database.

This means:

The database only exists in RAM.

It disappears once the script stops running.

No .db file is created.

3. Establishing a Connection

conn = engine.connect()

This opens a connection to the SQLite database.

The connection allows you to execute SQL queries.

4. Retrieving Table Names

print(engine.table_names())

Purpose: It attempts to list all tables in the database.

Problem: engine.table_names() is deprecated in SQLAlchemy 1.4+.

Alternative for SQLAlchemy 1.4+

Instead of engine.table_names(), use:

from sqlalchemy import inspect

inspector = inspect(engine)

print(inspector.get_table_names())  # Recommended

This is the correct way to retrieve table names in modern SQLAlchemy versions.

Final Output:

Since we haven't created any tables, the output will be:

[]