1、pickle套件
(1)、將記憶體中的物件轉換為文字流：
import pickle
# define class
class Bird(object):
have_feather = True
way_of_reproduction = 'egg'
summer = Bird() # construct an object
picklestring = pickle.dumps(summer) # serialize object
使用pickle.dumps()方法可以將物件summer轉換成了字串 picklestring(也就是文字流)。隨後我們可以用普通文字的儲存方法來將該字串儲存在檔案(文字檔案的輸入輸出)。
當然，我們也可以使用pickle.dump()的方法，將上面兩部合二為一:
import pickle
# define class
class Bird(object):
have_feather = True
way_of_reproduction = 'egg'
summer = Bird() # construct an object
fn = 'a.pkl'
with open(fn, 'w') as f: # open file with write-mode
picklestring = pickle.dump(summer, f) # serialize and save object對象summer存放在文件a.pkl
(2)、重建對象
首先，我們要從文本中讀出文本，儲存到字串(文本檔的輸入輸出)。然後使用pickle.loads(str)的方法，將字串轉換成為物件。要記得，此時我們的程式中必須已經有了該物件的類別定義。
import pickle
# define the class before unpickle
class Bird(object):
have_feather = True
way_of_reproduction = 'egg'
fn = 'a.pkl'
with open(fn, 'r') as f:
summer = pickle.load(f) # read file and build objectimport cPickle as pickle
就不需要再做任何改動了。
