title: Python Modules for Postgresql
tags: python postgresql db

# Psycopg
See [docs](https://www.psycopg.org/psycopg3/docs/basic/usage.html).
To install on ubuntu, `apt install python3-psycopg`, or generally can be done with PIP.

Usage: (from the docs)
```py
# Note: the module name is psycopg, not psycopg3
import psycopg

# Connect to an existing database
with psycopg.connect("dbname=test user=postgres") as conn:

    # Open a cursor to perform database operations
    with conn.cursor() as cur:

        # Execute a command: this creates a new table
        cur.execute("""
            CREATE TABLE test (
                id serial PRIMARY KEY,
                num integer,
                data text)
            """)

        # Pass data to fill a query placeholders and let Psycopg perform
        # the correct conversion (no SQL injections!)
        cur.execute(
            "INSERT INTO test (num, data) VALUES (%s, %s)",
            (100, "abc'def"))

        # Query the database and obtain data as Python objects.
        cur.execute("SELECT * FROM test")
        cur.fetchone()
        # will return (1, 100, "abc'def")

        # You can use `cur.fetchmany()`, `cur.fetchall()` to return a list
        # of several records, or even iterate on the cursor
        for record in cur:
            print(record)

        # Make the changes to the database persistent
        conn.commit()
```