python - python2和python3之间的pandas.DataFrame.load/save:pickle协议(protocol)问题

我还不知道如何使用熊猫数据帧在python 2和3之间进行pickle加载/保存。泡菜机里有一个“协议”选项，我玩得不成功，但我希望有人能给我一个快速的想法。下面是获取错误的代码：
蟒蛇2.7

>>> import pandas; from pylab import *
>>> a = pandas.DataFrame(randn(10,10))
>>> a.save('a2')
>>> a = pandas.DataFrame.load('a2')
>>> a = pandas.DataFrame.load('a3')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/pandas-0.10.1-py2.7-linux-x86_64.egg/pandas/core/generic.py", line 30, in load
    return com.load(path)
  File "/usr/local/lib/python2.7/site-packages/pandas-0.10.1-py2.7-linux-x86_64.egg/pandas/core/common.py", line 1107, in load
    return pickle.load(f)
ValueError: unsupported pickle protocol: 3

蟒蛇3

>>> import pandas; from pylab import *
>>> a = pandas.DataFrame(randn(10,10))
>>> a.save('a3')
>>> a = pandas.DataFrame.load('a3')
>>> a = pandas.DataFrame.load('a2')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.3/site-packages/pandas-0.10.1-py3.3-linux-x86_64.egg/pandas/core/generic.py", line 30, in load
    return com.load(path)
  File "/usr/local/lib/python3.3/site-packages/pandas-0.10.1-py3.3-linux-x86_64.egg/pandas/core/common.py", line 1107, in load
    return pickle.load(f)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xf4 in position 0: ordinal not in range(128)

也许期望pickle在Python版本之间工作有点乐观？

最佳答案

我也有同样的问题。您可以在python3中使用以下功能更改数据帧pickle文件的协议：

import pickle
def change_pickle_protocol(filepath,protocol=2):
    with open(filepath,'rb') as f:
        obj = pickle.load(f)
    with open(filepath,'wb') as f:
        pickle.dump(obj,f,protocol=protocol)

然后你应该能够打开它在python2没有问题。

关于python - python2和python3之间的pandas.DataFrame.load/save:pickle协议(protocol)问题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14586898/