human
I wrote the below code

    if (dbn == 'postgres'):
        try:
            import psycopg2 as db
        except ImportError:
            try:
                import psycopg as db
            except ImportError:
                import pgdb as db
        keywords['password'] = keywords['pw']
        del keywords['pw']
        keywords['database'] = keywords['db']
        del keywords['db']
    elif (dbn == 'mysql'):
        import MySQLdb as db
        keywords['passwd'] = keywords['pw']
        del keywords['pw']
        db.paramstyle = 'pyformat'
    elif (dbn == 'sqlite'):
        try:
            from pysqlite2 import dbapi2 as db
            db.paramstyle = 'qmark'
        except ImportError:
            import sqlite as db
        keywords['database'] = keywords['db']
        del keywords['db']
    else:
        raise UnknownDB, dbn
    ctx.db_name = dbn
    ctx.db_module = db
    ctx.db_transaction = False
    if _hasPooling:
        if ('db' not in globals()):
            globals()['db'] = PooledDB(dbapi=db, **keywords)
        ctx.db = globals()['db'].connection()
    else:
        ctx.db = db.connect(**keywords)
    ctx.dbq_count = 0
    if globals().get('db_printing'):
        def db_execute(cur, sql_query, d=None):
            'executes    an    sql    query'
            def sqlquote(obj):
                'converts    `obj`    to    its    proper    SQL    version'
                if (obj is None):
                    return 'NULL'
                elif (obj is True):
                    return "'t'"
                elif (obj is False):
                    return "'f'"
                elif isinstance(obj, datetime.datetime):
                    return repr(obj.isoformat())
                else:
                    return repr(obj)
            ctx.dbq_count += 1
            try:
                outq = (sql_query % tuple(map(sqlquote, d)))
            except TypeError:
                outq = sql_query
            print >>debug, (str(ctx.dbq_count) + ':'), outq
            a = time.time()
            out =...

What's a good function header?

=====
Give me a Python program to print >>debug, (str(ctx?
assistant
#Here is Python program to print >>debug, (str(ctx.

def connect(dbn, **keywords):