属性取消酸洗时出错:无法获取属性';位置'; [英] AttributeError while unpickling: Can't get attribute 'Location'
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问题描述
我正在为库存系统编写一个Python CGI脚本。它需要通过pickle
存储对象列表(称为locations
)。以下是我使用的代码:
try:
with open(".config/autosave.bin", "rb") as dataFile:
locations = pickle.load(dataFile)
except (FileNotFoundError, PermissionError):
dispHTML("p", contents="Error in load: Save file incorrectly configured!")
locations = []
但是,这会导致:
/Applications/MAMP/cgi-bin/ic/main.py in ()
16 try:
17 with open(".config/autosave.bin", "rb") as dataFile:
=> 18 locations = pickle.load(dataFile)
19 except (FileNotFoundError, PermissionError):
20 dispHTML("p", contents="Error in load: Save file incorrectly configured!")
AttributeError: Can't get attribute 'Location' on <module '__main__' from '/Applications/MAMP/cgi-bin/ic/main.py'>
args = ("Can't get attribute 'Location' on <module '__main__' from '/Applications/MAMP/cgi-bin/ic/main.py'>",)
with_traceback = <built-in method with_traceback of AttributeError object>
如您所见,保存文件存储在.config/autosave.bin
。写入似乎工作正常,但我无法检查。
我如何修复此问题?
推荐答案
读取泡菜代码需要Location
类的定义。否则,它将无法重新构造该类的自定义对象。
# config_writer.py
import pickle
class Location:
def __init__(self, store, aisle):
self.store = store
self.aisle = aisle
locations = [Location(i, i) for i in range(10)]
with open('.config/autosave.bin', 'wb') as f:
pickle.dump(locations, f)
下面是一个示例,它尝试在没有Location
(在另一个终端/会话中运行此代码)的类定义的情况下读取Pickle文件:
>>> import pickle
>>> with open('.config/autosave.bin','rb') as f:
... data = pickle.load(f)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
AttributeError: Can't get attribute 'Location' on <module '__main__' (built-in)>
但是,通过访问类定义:
>>> from config_writer import Location
>>> with open('.config/autosave.bin','rb') as f:
... data = pickle.load(f)
>>> data
[<config_writer.Location object at 0x7f8b472111d0>, <config_writer.Location object at 0x7f8b41ad6e48>, <config_writer.Location object at 0x7f8b41adb0f0>, <config_writer.Location object at 0x7f8b41adb128>, <config_writer.Location object at 0x7f8b41adb160>, <config_writer.Location object at 0x7f8b41adb198>, <config_writer.Location object at 0x7f8b41adb1d0>, <config_writer.Location object at 0x7f8b41adb208>, <config_writer.Location object at 0x7f8b41adb240>, <config_writer.Location object at 0x7f8b41adb278>]
希望读取Pickle文件的代码能够从其他模块导入Location
的类定义,就像我的示例一样。
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