Opening a file with open and mode read-binary already gives you a Binary I/O object. Documentation: The easiest way to create a binary stream is with open() with ‘b’ in the mode string: f = open(“myfile.jpg”, “rb”) So in normal circumstances, you’d be fine just passing the file handle wherever you need to supply it. … Read more
You should use io.StringIO for handling unicode objects and io.BytesIO for handling bytes objects in both python 2 and 3, for forwards-compatibility (this is all 3 has to offer). Here’s a better test (for python 2 and 3), that doesn’t include conversion costs from numpy to str/bytes import numpy as np import string b_data = … Read more
The issue is that you are positioned at the end of the stream. Think of the position like a cursor. Once you have written b’ world’, your cursor is at the end of the stream. When you try to .read(), you are reading everything after the position of the cursor – which is nothing, so … Read more
(This solution is from the author himself. I have just moved it here.) SOLUTION: # This portion is part of my test code byteImgIO = io.BytesIO() byteImg = Image.open(“some/location/to/a/file/in/my/directories.png”) byteImg.save(byteImgIO, “PNG”) byteImgIO.seek(0) byteImg = byteImgIO.read() # Non test code dataBytesIO = io.BytesIO(byteImg) Image.open(dataBytesIO) The problem was with the way that Image.tobytes()was returning the byte object. … Read more
It’s a file-like object. Read them: >>> b = io.BytesIO(b’hello’) >>> b.read() b’hello’ If the data coming in from body is too large to read into memory, you’ll want to refactor your code and use zlib.decompressobj instead of zlib.decompress.
You need to seek back to the beginning of the file after writing the initial in memory file… myio.seek(0)