腌制后pandas.DataFrame的子类的属性消失 [英] Attributes to a subclass of pandas.DataFrame disappear after pickle

问题描述

我正在尝试将属性添加到pandas.DataFrame的子类中，它们在酸洗和酸洗后会消失:

import cPickle
import pandas as pd

class MyClass(pd.DataFrame):
    def __init__(self):
        super(MyClass, self).__init__()
        self.bar = 1

myc = MyClass()
with open('myc.pickle', 'wb')as myfile:
    cPickle.dump(myc,myfile)
with open('myc.pickle', 'rb')as myfile:
    b = cPickle.load(myfile)
print b.bar

输出:

Traceback (most recent call last):
File "test_df.py", line 14, in <module>
print b.bar
File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 1771, in __getattr__
(type(self).__name__, name))
AttributeError: 'MyClass' object has no attribute 'bar'

有什么想法可以安全地添加属性吗?

解决方案

这与子类化无关.熊猫对象的属性不会序列化.

您可以阅读此主题进行讨论和解决方法. 其他最新主题中再次出现了这个话题. /p>

I am trying to add attributes to a subclass of pandas.DataFrame and they disappear after pickling and unpickling:

import cPickle
import pandas as pd

class MyClass(pd.DataFrame):
    def __init__(self):
        super(MyClass, self).__init__()
        self.bar = 1

myc = MyClass()
with open('myc.pickle', 'wb')as myfile:
    cPickle.dump(myc,myfile)
with open('myc.pickle', 'rb')as myfile:
    b = cPickle.load(myfile)
print b.bar

Output:

Traceback (most recent call last):
File "test_df.py", line 14, in <module>
print b.bar
File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 1771, in __getattr__
(type(self).__name__, name))
AttributeError: 'MyClass' object has no attribute 'bar'

Any idea how I can add attributes safely?

解决方案

This is unrelated to subclassing. Pandas objects' attributes do not serialize.

You can read this thread for a discussion and a workaround. The topic has resurfaced again in this other recent thread.

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