_replace_atomic not working on Windows 10

[untitaker]

_replace_atomic not working on Windows 10

[untitaker]

@kiudee could it be that your file is just created in a folder you have no permissions for? I'm not entirely sure what I need to do to repro this.

[kiudee]

No, a normal

np.savez_compressed(path, arr)

works, which is why I use the following workaround for now:

if os.name == "nt":
    np.savez_compressed(data_path, arr)
else:
    with AtomicWriter(data_path, mode="wb", overwrite=True).open() as f:
        np.savez_compressed(f, arr)

edit: I will try if I can reproduce the problem in different environments and folders.

[kiudee]

I was able to reproduce the problem now using the following steps:

import numpy as np
from atomicwrites import AtomicWriter

arr = np.linspace(0, 1, num=10)
# Works without a problem:
with AtomicWriter("test.npz", mode="wb", overwrite=True).open() as f:
    np.savez_compressed(f, arr)

data = np.load("test.npz")
# PermissionError happens here:
with AtomicWriter("test.npz", mode="wb", overwrite=True).open() as f:
    np.savez_compressed(f, arr)

Reading up on numpy.load(), it turns out that in the case of .npz (i.e. compressed) files it actually opens the file and it needs to be explicitly closed again. I wonder why the PermissionError does not happen on Linux systems.

But since this is not an issue with atomicwrites, I will close the issue.