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  1. SQLite3 is a lightweight disk-based database that doesn’t require a separate server process. Python's sqlite3 module provides an SQL interface compliant with the DB-API 2.0 specification.

    Example: Creating and Using a Database

    import sqlite3

    # Connect to SQLite database (or create it if it doesn't exist)
    conn = sqlite3.connect('example.db')

    # Create a cursor object
    cursor = conn.cursor()

    # Create a table
    cursor.execute('''CREATE TABLE IF NOT EXISTS stocks
    (date text, trans text, symbol text, qty real, price real)''')

    # Insert a row of data
    cursor.execute("INSERT INTO stocks VALUES ('2006-01-05','BUY','RHAT',100,35.14)")

    # Commit the changes
    conn.commit()

    # Query the database
    cursor.execute("SELECT * FROM stocks")
    print(cursor.fetchall())

    # Close the connection
    conn.close()
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    Key Points

    1. Connecting to Database: Use sqlite3.connect('database_name.db') to connect to an SQLite database. If the database does not exist, it will be created.

    2. Creating Tables: Use CREATE TABLE SQL command to create tables. The example above creates a table named stocks.

    3. Inserting Data: Use INSERT INTO SQL command to insert data into tables.

    4. Querying Data: Use SELECT SQL command to retrieve data from tables.

    5. Committing Transactions: Use conn.commit() to save changes made during the transaction.

    6. Closing Connection: Always close the connection using conn.close() to free up resources.

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