art_galleries.keys()

dict_keys(['10021', '10013', '10001', '10009', '10011',
   ...: '10022', '10027', '10019', '11106', '10128'])

print(art_galleries['10027'])

{"Paige's Art Gallery": '(212) 531-1577', 
 'Triple Candie': '(212) 865-0783', 
 'Africart Motherland Inc': '(212) 368-6802', 
 'Inner City Art Gallery Inc': '(212) 368-4941'}

• .keys() 方法显示给定字典的键