Numpy savez将我的密钥解释为文件名-> IOError [英] Numpy savez interprets my keys as filenames -> IOError

问题描述

我正在将 numpy savez 用作推荐以保存numpy数组.作为键，我使用从中加载数据的文件的名称.但是似乎savez试图以某种方式使用文件名.我该怎么办?我想避免剥离其路径和结尾的文件名.

I am using numpy savez as recommended to save numpy arrays. As keys I use the names of the files I have loaded the data from. But it seems like savez is trying to use the filenames somehow. What should I do? I would like to avoid stripping the file names of their path and ending.

>>> import numpy
>>> arrs = {'data/a.text': numpy.array([1,2]),
            'data/b.text': numpy.array([3,4]),
            'data/c.text': numpy.array([5,6])}    
>>> numpy.savez('file.npz', **arrs)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/lib/python2.6/dist-packages/numpy/lib/io.py", line 305, in savez
    fid = open(filename,'wb')
IOError: [Errno 2] No such file or directory: '/tmp/data/c.text.npy'

推荐答案

您可以在将密钥传递给savez函数之前对其进行编码和解码.

You can encode and decode the keys before you pass it to the savez function.

>>> import numpy
>>> import base64
>>> arrs = {'data/a.text': numpy.array([1,2]),
            'data/b.text': numpy.array([3,4]),
            'data/c.text': numpy.array([5,6])}
>>> numpy.savez('file.npz', **dict((base64.urlsafe_b64encode(k), v)
                                    for k,v in arrs.iteritems()))
>>> npzfile = numpy.load('file.npz')
>>> decoded = dict((base64.urlsafe_b64decode(k), v)
                   for k,v in npzfile.iteritems())
>>> decoded
{'data/c.text': array([5, 6]),
 'data/a.text': array([1, 2]),
 'data/b.text': array([3, 4])}

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