numpy genfromtxt columns

Question

我在 numpy genfromtxt 上遇到了一个看似非常简单的问题。这是我代码的(非常(简化版本：

import numpy as np
in_file_1 = raw_input ('enter name of template file to be scaled:n')
spec_1 = np.genfromtxt(in_file_1, delimiter = [8,24], dtype =float)
print spec_1

我正在读取的文件非常简单，两列没有标题等：

6392.01   0.90286163
6392.05   0.88731778
6392.09   0.87789831
6392.13   0.87716535
6392.16   0.88523003
6392.20   0.90948176
6392.24   0.93056874
6392.28   0.95782283
6392.32   0.98056805
6392.36   0.99623797
6392.39   0.99458828
6392.43   0.9848269
6392.47   0.96011146
6392.51   0.92864767

当我在python

命令行上使用genfromtxt阅读上述内容时，它给了我预期的两列数组：

>>> import numpy as np
>>> in_file_1 = raw_input ('enter name of template file to be scaled:n')
enter name of template file to be scaledl_1714650_052_no_head.txt
>>> spec_1 = np.genfromtxt(in_file_1, delimiter = [8,24], dtype =float)
>>> spec_1
array([[  6.39201000e+03,   9.02861630e-01],
       [  6.39205000e+03,   8.87317780e-01],
       [  6.39209000e+03,   8.77898310e-01],
       [  6.39213000e+03,   8.77165350e-01],
       [  6.39216000e+03,   8.85230030e-01],
       [  6.39220000e+03,   9.09481760e-01],
       [  6.39224000e+03,   9.30568740e-01],
       [  6.39228000e+03,   9.57822830e-01],
       [  6.39232000e+03,   9.80568050e-01],
       [  6.39236000e+03,   9.96237970e-01],
       [  6.39239000e+03,   9.94588280e-01],
       [  6.39243000e+03,   9.84826900e-01],
       [  6.39247000e+03,   9.60111460e-01],
       [  6.39251000e+03,   9.28647670e-01]])
>>> 

但是当我将其作为本文顶部的脚本 (read_test.py( 运行时，它会返回一列字符串：

[scrooge:Acc_cont_removal/All_stars/Test] darryl% python read_test.py 
enter name of template file to be scaled:
l_1714650_052_no_head.txt
[[  6.39201000e+03   9.02861630e-01]
 [  6.39205000e+03   8.87317780e-01]
 [  6.39209000e+03   8.77898310e-01]
 [  6.39213000e+03   8.77165350e-01]
 [  6.39216000e+03   8.85230030e-01]
 [  6.39220000e+03   9.09481760e-01]
 [  6.39224000e+03   9.30568740e-01]
 [  6.39228000e+03   9.57822830e-01]
 [  6.39232000e+03   9.80568050e-01]
 [  6.39236000e+03   9.96237970e-01]
 [  6.39239000e+03   9.94588280e-01]
 [  6.39243000e+03   9.84826900e-01]
 [  6.39247000e+03   9.60111460e-01]
 [  6.39251000e+03   9.28647670e-01]]
[scrooge:Acc_cont_removal/All_stars/Test] darryl% 

我已经尝试了分隔符等的各种配置，但我无法弄清楚发生了什么，并且几天前这段代码运行良好。在OSX(Lion(上运行，python v2.7。

任何想法都感激不尽。达里尔

Answer 1

你得到的答案正是你应该得到的！

>>> numpy.genfromtxt('testfile', delimiter=[8,24], dtype = float)
array([[  6.39201000e+03,   9.02861630e-01],
       [  6.39205000e+03,   8.87317780e-01],
       [  6.39209000e+03,   8.77898310e-01],
       [  6.39213000e+03,   8.77165350e-01],
       [  6.39216000e+03,   8.85230030e-01],
       [  6.39220000e+03,   9.09481760e-01],
       [  6.39224000e+03,   9.30568740e-01],
       [  6.39228000e+03,   9.57822830e-01],
       [  6.39232000e+03,   9.80568050e-01],
       [  6.39236000e+03,   9.96237970e-01],
       [  6.39239000e+03,   9.94588280e-01],
       [  6.39243000e+03,   9.84826900e-01],
       [  6.39247000e+03,   9.60111460e-01],
       [  6.39251000e+03,   9.28647670e-01]])
>>> print _
[[  6.39201000e+03   9.02861630e-01]
 [  6.39205000e+03   8.87317780e-01]
 [  6.39209000e+03   8.77898310e-01]
 [  6.39213000e+03   8.77165350e-01]
 [  6.39216000e+03   8.85230030e-01]
 [  6.39220000e+03   9.09481760e-01]
 [  6.39224000e+03   9.30568740e-01]
 [  6.39228000e+03   9.57822830e-01]
 [  6.39232000e+03   9.80568050e-01]
 [  6.39236000e+03   9.96237970e-01]
 [  6.39239000e+03   9.94588280e-01]
 [  6.39243000e+03   9.84826900e-01]
 [  6.39247000e+03   9.60111460e-01]
 [  6.39251000e+03   9.28647670e-01]]

这只是打印和获取结果表示之间的区别。

>>> result = numpy.genfromtxt('testfile', delimiter=[8,24], dtype = float)
>>> repr(result)
'array([[  6.39201000e+03,   9.02861630e-01],n       [  6.39205000e+03,   8.87317780e-01],n       [  6.39209000e+03,   8.77898310e-01],n       [  6.39213000e+03,   8.77165350e-01],n       [  6.39216000e+03,
  8.85230030e-01],n       [  6.39220000e+03,   9.09481760e-01],n       [  6.39224000e+03,   9.30568740e-01],n       [  6.39228000e+03,   9.57822830e-01],n       [  6.39232000e+03,   9.80568050e-01],n
[  6.39236000e+03,   9.96237970e-01],n       [  6.39239000e+03,   9.94588280e-01],n       [  6.39243000e+03,   9.84826900e-01],n       [  6.39247000e+03,   9.60111460e-01],n       [  6.39251000e+03,   9.2864
7670e-01]])'
>>> str(result)
'[[  6.39201000e+03   9.02861630e-01]n [  6.39205000e+03   8.87317780e-01]n [  6.39209000e+03   8.77898310e-01]n [  6.39213000e+03   8.77165350e-01]n [  6.39216000e+03   8.85230030e-01]n [  6.39220000e+03
 9.09481760e-01]n [  6.39224000e+03   9.30568740e-01]n [  6.39228000e+03   9.57822830e-01]n [  6.39232000e+03   9.80568050e-01]n [  6.39236000e+03   9.96237970e-01]n [  6.39239000e+03   9.94588280e-01]n [
 6.39243000e+03   9.84826900e-01]n [  6.39247000e+03   9.60111460e-01]n [  6.39251000e+03   9.28647670e-01]]'

注意到 str 版本没有逗号，但 repr 有吗？