Python变量和文件 [英] Python variables and files

问题描述

有什么办法可以让我可以把一个文件作为一个变量？
作为一个例子，当调用从PIL Image模块保存的函数时： Image.save（foo.jpg）我想要所有的数据不是保存在硬盘上，而是在变量 a 中引入，这样当 a.read（）被调用，它应该返回文件的内容。

解决方案

您可以使用 BytesIO 类将PIL Image保存为字节流。

 >>>从PIL导入Image 
>>> im = Image.open（'ball.png'）
>>> from io import BytesIO 
>>> buffer = BytesIO（）
>>> im.save（buffer，format ='png'）
>>> buffer.getvalue（）
'\x89PNG\r\\\
\x1a\\\
\x00\ ... 
  

可能值得通读整个 io模块页面，它很短，很多很好的信息，包含String3 ch3ka指出。

Is there any way I can make so that I can treat a file as a variable? As an example when the function save from PIL Image module is called: Image.save("foo.jpg") i would like all the data not to save on the hard disk but to be introduced in a variable a so that when a.read() is called, it should return what the content of the file would be.

解决方案

You can use the BytesIO class to save a PIL Image to a byte stream.

>>> from PIL import Image
>>> im = Image.open('ball.png')
>>> from io import BytesIO
>>> buffer = BytesIO()
>>> im.save(buffer, format='png')
>>> buffer.getvalue()
'\x89PNG\r\n\x1a\n\x00\ ... 

It's probably worth reading through the whole io module page, it's pretty short, lots of good info, contains StringIO as ch3ka pointed out.

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