目录

Python3中的StringIO

Python3中的StringIO

本文翻译自:

I am using Python 3.2.1 and I can’t import the StringIO module. 我正在使用Python 3.2.1,但无法导入 StringIO 模块。 I use io.StringIO and it works, but I can’t use it with numpy ’s genfromtxt like this: 我使用 io.StringIO 并且可以工作,但是不能将其与 numpygenfromtxt 一起使用,如下所示:

x="1 3\n 4.5 8"        
numpy.genfromtxt(io.StringIO(x))

I get the following error: 我收到以下错误:

TypeError: Can't convert 'bytes' object to str implicitly  

and when I write import StringIO it says 当我写 import StringIO 时说

ImportError: No module named 'StringIO'

#1楼

参考:


#2楼

On Python 3 numpy.genfromtxt expects a bytes stream. 在Python 3上, numpy.genfromtxt 需要字节流。 Use the following: 使用以下内容:

numpy.genfromtxt(io.BytesIO(x.encode()))

#3楼

when i write import StringIO it says there is no such module. 当我写导入StringIO时,它说没有这样的模块。

From : 从 :

The StringIO and cStringIO modules are gone. StringIOcStringIO 模块不见了。 Instead, import the io module and use io.StringIO or io.BytesIO for text and data respectively. 而是导入 io 模块,并将 io.StringIOio.BytesIO 分别用于文本和数据。

.


A possibly useful method of fixing some Python 2 code to also work in Python 3 (caveat emptor): 修复一些Python 2代码以使其在Python 3(caveat emptor)中工作的可能有用的方法:

try:
    from StringIO import StringIO ## for Python 2
except ImportError:
    from io import StringIO ## for Python 3

Note: This example may be tangential to the main issue of the question and is included only as something to consider when generically addressing the missing StringIO module. 注意:此示例可能与问题的主要内容相切,仅作为一般性地解决缺少的 StringIO 模块时要考虑的 StringIO For a more direct solution the the message TypeError: Can't convert 'bytes' object to str implicitly , see . 要获得更直接的解决方案,请输入消息 TypeError: Can't convert 'bytes' object to str implicitly ,请参见此 。


#4楼

就我而言,我使用了:

from io import StringIO

#5楼

Thank you OP for your question, and Roman for your answer. 谢谢OP的问题,以及Roman的回答。 I had to search a bit to find this; 我不得不花点时间找到它。 I hope the following helps others. 希望以下内容对他人有所帮助。

Python 2.7 Python 2.7

See: 请参阅: :

import numpy as np
from StringIO import StringIO

data = "1, abc , 2\n 3, xxx, 4"

print type(data)
"""
<type 'str'>
"""

print '\n', np.genfromtxt(StringIO(data), delimiter=",", dtype="|S3", autostrip=True)
"""
[['1' 'abc' '2']
 ['3' 'xxx' '4']]
"""

print '\n', type(data)
"""
<type 'str'>
"""

print '\n', np.genfromtxt(StringIO(data), delimiter=",", autostrip=True)
"""
[[1.  nan   2.]
 [  3.  nan   4.]]
"""

Python 3.5: Python 3.5:

import numpy as np
from io import StringIO
import io

data = "1, abc , 2\n 3, xxx, 4"
#print(data)
"""
1, abc , 2
3, xxx, 4
"""

#print(type(data))
"""
<class 'str'>
"""

#np.genfromtxt(StringIO(data), delimiter=",", autostrip=True)

# TypeError: Can't convert 'bytes' object to str implicitly

print('\n')
print(np.genfromtxt(io.BytesIO(data.encode()), delimiter=",", dtype="|S3", autostrip=True))
"""
[[b'1' b'abc' b'2']
 [b'3' b'xxx' b'4']]
"""

print('\n')
print(np.genfromtxt(io.BytesIO(data.encode()), delimiter=",", autostrip=True))
"""
[[1.  nan   2.]
 [  3.  nan   4.]]
"""

Aside: 在旁边:

dtype="|Sx", where x = any of { 1, 2, 3, …}: dtype =“ | Sx”,其中 x = {1,2,3,…}中的任何一个:

“The |S1 and |S2 strings are data type descriptors; the first means the array holds strings of length 1, the second of length 2. …” “ | S1 和| S2 字符串是数据类型描述符;第一个表示数组保存长度为 1 的字符串,第二个表示长度为 2…。”


#6 楼

You can use the from the module: 您可以从 模块中使用 :

import six
import numpy

x = "1 3\n 4.5 8"
numpy.genfromtxt(six.StringIO(x))