[mysql]
host = localhost
database = python_mysql
user = root
password =

def read_db_config(filename='config.ini', section='mysql'):

    parser = ConfigParser()
    parser.read(filename)

    db = {}
    if parser.has_section(section):
        items = parser.items(section)
        for item in items:
            db[item[0]] = item[1]
    else:
        raise Exception('{0} not found in the {1} file'.format(section, filename))

    return db

...
conn = mysql.connector.connect(host='localhost',
                                       database='python_mysql',
                                       user='root',
                                       password='secret')
...