[Answered ]-How to retrieve file's with grid fs

fs = gridfs.GridFS(db)
gridout = fs.get_last_version("testimage")

The gridout object is an instance of GridOut for reading files. You could get all the bytes at once with gridout.read(), or iterate over chunks of bytes like:

for chunk in gridout:
    do_something_with(chunk)

GridFS chunks are about 256k by default.