用python来连接postgres

import psycopg2

# Establish the connection to our database
connection = psycopg2.connect('dbname=example')

# Working within session where we can start committing these transactions
# Queue up work into our transaction, we first have to start interacting with a cursor
# Cursor is basically an interface that allows you to start queuing up work and transactions. 
cursor = connection.cursor()

# cursor.execute immediately start executing work on the database.
# Create a transaction
cursor.execute('''
    CREATE TABLE table2 (
        id INTEGER PRIMARY KEY,
        completed BOOLEAN NOT NULL DEFAULT False
    );
''') 

cursor.execute('INSERT INTO table2 (id, completed) VALUES (1, true);')

# Commit the work to the database
# connection.commite() will wound up committing both the create table and the insert into altogether. 
connection.commit()

# Clost the connection
# Psychopg2 will not automatically close out your connection for you. 
connection.close()
cursor.close()

在Terminal里，就可以看到已经创建好了table2