python python类文件缓冲对象
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python file-like buffer object
提问by djs
I've written a buffer class that provides a File-like interface with read, write, seek, tell, flushmethods to a simple string in memory. Of course it is incomplete (e.g. I didn't write readline). It's purpose is to be filled by a background thread from some external data source, but let a user treat it like a file. I'd expect it to contain a relatively small amount of data (maybe 50K max)
我编写了一个缓冲区类，它提供了一个类似文件的接口，其中包含read, write, seek, tell,flush方法到内存中的一个简单字符串。当然它是不完整的（例如我没有写readline）。它的目的是由来自某些外部数据源的后台线程填充，但让用户将其视为文件。我希望它包含相对少量的数据（最大可能是 50K）
Is there a better way to do this instead of writing it from scratch?
有没有更好的方法来做到这一点而不是从头开始编写？
回答by Triptych
You can use the standard Python modules StringIOor cStringIOto obtain an in-memory buffer which implements the file interface.
您可以使用标准 Python 模块StringIO或cStringIO获取实现文件接口的内存缓冲区。
cStringIOis implemented in C, and will be faster, so you should use that version if possible.
cStringIO是用 C 实现的，速度会更快，所以你应该尽可能使用那个版本。
If you're using Python 3 you should use the io.StringIOinstead of StringIOand io.BytesIOinstead of cStringIO.
如果您使用的是 Python 3，则应使用io.StringIO代替StringIO和io.BytesIO代替cStringIO。
回答by Randy Morris
I think you might be looking for StringIO.
我想你可能正在寻找StringIO.
