npyfile is a a package that allows you to continuously write arrays to a .npy file. You can use it like a
standard Python file with the well-known context manager.
Warning: Due to the internal structure of .npy files, the arrays must have the same shape & dtype.
Generate some artificial dummy data, e.g. images, & write them into a temporary file. A real world scenario reflecting this is the continuous arrival of new images from a camera.
importpathlibimporttempfiletmp_dir=tempfile.TemporaryDirectory()
outfile=pathlib.Path(tmp_dir.name) /'images.npy'images=np.random.randint(low=0, high=255, size=(10,640,480,3))
withNpyFile(outfile) asfile:
forimginimages:
file.write(img)
np.testing.assert_array_equal(images, np.load(outfile))
tmp_dir.cleanup()