Python，如何处理"ValueError:不支持的pickle协议:4"；错误? [英] Python, how to handle the "ValueError: unsupported pickle protocol: 4" error?

问题描述

我是Python的新手. 我必须运行 TargetFinder脚本(自定义分析").

I'm new to Python. I've to run this TargetFinder script ("Custom Analyses").

我安装了所有必需的python软件包，并将代码复制到名为main.py的脚本中并运行它. 我收到此错误:

I installed all the required python packages, and copied the code into a script I named main.py, and ran it. I got this error:

[davide@laptop]$ python main.py 
Traceback (most recent call last):
  File "main.py", line 8, in <module>
    training_df = pd.read_hdf('./paper/targetfinder/K562/output-epw/training.h5', 'training').set_index(['enhancer_name', 'promoter_name'])
  File "/usr/lib64/python2.7/site-packages/pandas/io/pytables.py", line 330, in read_hdf
    return store.select(key, auto_close=auto_close, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pandas/io/pytables.py", line 680, in select
    return it.get_result()
  File "/usr/lib64/python2.7/site-packages/pandas/io/pytables.py", line 1364, in get_result
    results = self.func(self.start, self.stop, where)
  File "/usr/lib64/python2.7/site-packages/pandas/io/pytables.py", line 673, in func
    columns=columns, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pandas/io/pytables.py", line 2786, in read
    values = self.read_array('block%d_values' % i)
  File "/usr/lib64/python2.7/site-packages/pandas/io/pytables.py", line 2327, in read_array
    data = node[:]
  File "/usr/lib64/python2.7/site-packages/tables/vlarray.py", line 677, in __getitem__
    return self.read(start, stop, step)
  File "/usr/lib64/python2.7/site-packages/tables/vlarray.py", line 817, in read
    outlistarr = [atom.fromarray(arr) for arr in listarr]
  File "/usr/lib64/python2.7/site-packages/tables/atom.py", line 1211, in fromarray
    return cPickle.loads(array.tostring())
ValueError: unsupported pickle protocol: 4

我不知道这种泡菜协议是什么意思，而且我的同事对此一无所知.

I've no idea about what this pickle protocol means, and also my colleagues know nothing about it.

如何解决此问题?

我在CentOS Linux版本7.2.1511(核心)操作系统上使用Python 2.7.5

I'm using Python 2.7.5 on a CentOS Linux release 7.2.1511 (Core) operating system

推荐答案

Pickle协议基本上是文件格式.从文档， 使用的协议越高，读取生产的泡菜所需的Python版本越新. ... 在Python 3.4中添加了Pickle协议版本4 ，这是您的python版本(2.7.5)不支持此功能.

The Pickle protocol is basically the file format. From the documentation, The higher the protocol used, the more recent the version of Python needed to read the pickle produced. ... Pickle protocol version 4 was added in Python 3.4, your python version (2.7.5) does not support this.

要么升级到Python 3.4或更高版本(当前版本为3.5)，要么在pickle.dump()的第三个参数中使用较低的协议(2)创建泡菜.

Either upgrade to Python 3.4 or later (current is 3.5) or create the pickle using a lower protocol (2) in the third parameter to pickle.dump().

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