Creating a dictionary is easy. The syntax is similar to sets [FIXME link fails because section is not written yet], but instead of values, you have key-value pairs. Once you have a dictionary, you can look up values by their key.
->>> a_dict = {'server':'db.diveintopython3.org', 'database':'mysql'} ① +>>> a_dict = {'server': 'db.diveintopython3.org', 'database': 'mysql'} ① >>> a_dict {'server': 'db.diveintopython3.org', 'database': 'mysql'} ->>> a_dict['server'] ② +>>> a_dict['server'] ② 'db.diveintopython3.org' ->>> a_dict['database'] ③ +>>> a_dict['database'] ③ 'mysql' ->>> a_dict['db.diveintopython3.org'] ④ +>>> a_dict['db.diveintopython3.org'] ④ Traceback (most recent call last): File "<stdin>", line 1, in <module> KeyError: 'db.diveintopython3.org'