写入内存文件而不是文件路径

Question

Is it possible to supply a path to the buffer where to write the data instead of supplying a file path eg instead of object.save("D:\\filename.jpg") supply it a path to memory buffer. I want to do this to avoid writing the image object data to file as .JPG and save it directly into memory so that I can have it in memory rather than loading it again from disk.

Answer 1

我相信您正在寻找StringIO库。

Answer 2

If you want a raw buffer of bytes to write to, use bitstring .

>>> a = BitArray('0x1af')
>>> a.hex, a.bin, a.uint     # Different interpretations using properties
('1af', '000110101111', 431)

If you don't want a raw array of bits/bytes, then just keep your image object in memory. It's basically the same thing as a file, just, as you say -- in memory not on disk.

Answer 3

If object.save supports file-like objects, that means, objects, that have a write-method, you can provide the method with a StringIO.StringIO instance. It has the same interface as a normal file-object, but keeps its contents in memory.