create_tables.py

import configparser
import psycopg2
from sql_queries import create_table_queries, drop_table_queries


def execute_queries(cur, conn, query_list):
    """Drops database tables
    Args:
        cur (:obj:`psycopg2.extensions.cursor`): Cursor for connection
        con (:obj:`psycopg2.extensions.connection`): database connection
        query_list (list): list of queries to executed
    Returns:
        None
    """
    for query in query_list:
        try:
            cur.execute(query)
            conn.commit()
        except psycopg2.Error as e:
            print("Error executing query: " + query)
            print(e)


def main():

    config = configparser.ConfigParser()
    config.read('dwh.cfg')

    conn = psycopg2.connect("host={} dbname={} user={} password={} port={}"\
            .format(*config['CLUSTER'].values()))
    cur = conn.cursor()

    execute_queries(cur, conn, drop_table_queries) # drop tables
    execute_queries(cur, conn, create_table_queries) # create tables

    conn.close()


if __name__ == "__main__":
    main()