将字符串视为python中的文件 [英] Treat a string as a file in python
问题描述
为了 not 重写开源库，我想将一串文本作为python 3中的文件处理.
In the interest of not rewriting an open source library, I want to treat a string of text as a file in python 3.
假设我将文件内容作为字符串:
Suppose I have the file contents as a string:
not_a_file = 'there is a lot of blah blah in this so-called file'
我想将此变量(即文件的内容)视为功能.
I want to treat this variable, i.e. the contents of a file, as a path-like object that way I can use it in python's open() function.
这是一个显示我的困境的简单示例:
Here is a simple example which shows my dilemma:
not_a_file = 'there is a lot of blah blah in this so-called file'
file_ptr = open(not_a_file, 'r')
很明显，该示例不起作用，因为not_a_file不是类似路径的对象.我不想写文件，也不想创建任何临时目录以方便携带.
Clearly the example doesn't work because not_a_file is not a path-like object. I don't want to write a file nor create any temporary directories for portability purposes.
话虽如此，我需要解决这个谜团:
With that said, I need is to solve this mystery:
not_a_file = 'there is a lot of blah blah in this so-called file'
... Something goes here ...
file_ptr = open(also_not_a_file, 'r')
到目前为止我尝试过的事情
-
我研究了StringIO，并尝试将其用作类似路径的对象并且没有骰子:
import StringIO output = StringIO.StringIO() output.write('First line.\n') file_ptr = open(output,'r')嗯，这是行不通的，因为StringIO不是路径类对象.
I've looked into StringIO and tried using that as a path-like object and no dice:
import StringIO output = StringIO.StringIO() output.write('First line.\n') file_ptr = open(output,'r')Well this doesn't work because StringIO isn't a path-like object.
我以类似的方式尝试了tempfile，但没有成功.
import tempfile
tp = tempfile.TemporaryFile()
tp.write(b'there is a lot of blah blah in this so-called file')
open(tp,'r')
I've tried tempfile in a similar fashion with no success.
import tempfile
tp = tempfile.TemporaryFile()
tp.write(b'there is a lot of blah blah in this so-called file')
open(tp,'r')
感谢您的帮助！ :-)
Any help is appreciated! :-)
如果 PurePath 初始化为文件.也许我可以创建一个继承PurePath的类的实例，当被open()读取时，它会读取我的字符串.让我举个例子:
So pathlib.PurePath can work with open() if PurePath is initialized to a file. Perhaps I can create an instance of a class that inherits PurePath and when read by open(), it reads my string. Let me give an example:
from pathlib import PurePath
not_a_file = 'there is a lot of blah blah in this so-called file'
class Magic(PurePath):
def __init__(self, string_input):
self.file_content = string_input
PurePath.__init__(self, 'Something magical goes here')
#some more magic happens in this class
also_not_a_file = Magic(not_a_file)
fp = open(also_not_a_file,'r')
print(fp.readlines()) # 'there is a lot of blah blah in this so-called file'
推荐答案
您可以创建一个临时文件并传递其名称以打开:
You can create a temporary file and pass its name to open:
在Unix上:
tp = tempfile.NamedTemporaryFile()
tp.write(b'there is a lot of blah blah blah in this so-called file')
tp.flush()
open(tp.name, 'r')
在Windows上，您需要先关闭临时文件，然后才能打开它:
On Windows, you need to close the temporary file before it can be opened:
tp = tempfile.NamedTemporaryFile(delete=False)
tp.write(b'there is a lot of blah blah blah in this so-called file')
tp.close()
open(tp.name, 'r')
使用完文件后，您将负责删除该文件.
You then become responsible for deleting the file once you're done using it.
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