pickle序列化2

 1 import pickle
 2 
 3 # 使用pickle模块将数据对象保存到文件
 4 data1 = {‘a‘: [1, 2.0, 3, 4+6j],
 5          ‘b‘: (‘string‘, u‘Unicode string‘),
 6          ‘c‘: None}
 7 selfref_list = [1, 2, 3]
 8 selfref_list.append(selfref_list)
 9 print(selfref_list)
10 output = open(‘data.pkl‘, ‘wb‘)
11 # Pickle dictionary using protocol 0.
12 pickle.dump(data1, output)
13 # Pickle the list using the highest protocol available.
14 pickle.dump(selfref_list, output, -1)  # 没明白：运行结果显示没产生作用
15 output.close()
16 pkl_file = open(‘data.pkl‘, ‘rb‘)
17 print(pickle.load(pkl_file))
18 pkl_file.close()