使用Python，如何在内存中读取/写入数据，就像使用文件一样？

Question

I'm used to C++, and I build my data handling classes/functions to handle stream objects instead of files. I'd like to know how I might modify the following code, so that it can handle a stream of binary data in memory, rather than a file handle.

def get_count(self):
    curr = self.file.tell()
    self.file.seek(0, 0)
    count, = struct.unpack('I', self.file.read(c_uint32_size))
    self.file.seek(curr, 0)
    return count

In this case, the code assumes self.file is a file, opened like so:

file = open('somefile.data, 'r+b')

How might I use the same code, yet instead do something like this:

file = get_binary_data()

Where get_binary_data() returns a string of binary data. Although the code doesn't show it, I also need to write to the stream (I didn't think it was worth posting the code for that).

Also, if possible, I'd like the new code to handle files as well.

Answer 1

您可以使用StringIO.StringIO （或cStringIO.StringIO ，更快）的实例为内存数据提供类似文件的接口。

Answer 2

看一下Python的StringIO模块， 这里的文档 ，这可能就是你所追求的。

Answer 3

看看'StringIO' （读写字符串作为文件）

Answer 4

使用StringIO 。

Answer 5

I like the timing of the answer. (except mine)

We can see response time in milliseconds ?

of-course StringIO