泡菜：picklingerror：can can can pickle＆lt; class＆＃x27; __ main __。

Question

Pickle无法将数据转储到文件中。我在做什么错？该错误表明 main 上的类属性失败。我已经检查了互联网，但没有太多清晰度。代码如下所示，

import pickle


class Title:
    def __init__(self, title, platform, size, price):
        self.title = title
        self.platform = platform
        self.size = size
        self.price = price

    def display(self):
        print("Printing the title details", '\n')
        print('TITLE:{} , PLATFORM:{}, SIZE:{} , PRICE:{}'
              .format(self.title, self.platform, self.size, self.price))


g = Title("Battlefield V", "Steam", "65GB", "1200")

""" Serialisation to be done of the instance g using pickle module"""

with open('game.csv', 'wb') as f:
    pickle.dump(g, f)
print('serialization is complete - file object created')

with open('game.ser', 'rb') as f:
    game_obj = pickle.load(f)
print('Deserialization is complete - python obj created')

game_obj.display()

错误消息如下：

pickle.PicklingError: Can't pickle <class '__main__.Title'>: attribute lookup      Title on __main__ failed

Answer 1

您在文件名中有一个错误，腌制文件的命名与您试图取消列出的文件的命名不同，否则它可以按照python 3.7.3和2.7.16的固定来工作，当时名称已修复时：

$ python3 test.py 
serialization is complete - file object created
Deserialization is complete - python obj created
Printing the title details 

TITLE:Battlefield V , PLATFORM:Steam, SIZE:65GB , PRICE:1200
$ python2 test.py 
serialization is complete - file object created
Deserialization is complete - python obj created
('Printing the title details', '\n')
TITLE:Battlefield V , PLATFORM:Steam, SIZE:65GB , PRICE:1200

即使您的原始代码也有不同的错误消息：

$ python3 test.py 
serialization is complete - file object created
Traceback (most recent call last):
  File "test.py", line 27, in <module>
    with open('game.ser', 'rb') as f:
FileNotFoundError: [Errno 2] No such file or directory: 'game.ser'

似乎您的示例代码没有您最初在某些较大应用中遇到的问题。