Fix temp file removal

[Ericgig]

Description
Properly remove temp pyx files.

Related issues or PRs
fix #2231

[coveralls]

coverage: 70.419%. remained the same when pulling 2d3e551 on Ericgig:fixes_4.7_pxy into d8eef4d on qutip:qutip-4.7.X.

[hodgestar]

Is it possible to add a tiny test for this?

[Ericgig]

Not sure how to make a test for this. The file name is random and it's not always reliable when the __del__ is called which is where the file is erased.

[hodgestar]

Not sure how to make a test for this. The file name is random and it's not always reliable when the __del__ is called which is where the file is erased.

You could create a coefficient and check that the last entry of coeff_files.file_list looks correct and exists. The wouldn't check the deletion but would check that the filename is correct.

You can do del qutip.qobjevo.coeff_files to trigger the clean-up of the object, but that is a bit GC dependent and implementing it properly would require calling gc.collect(). Not sure if that is worth the hassle.

[HarshBabla99]

Hi, thanks for fixing this issue.
However, its release seems to be stalled because of other incomplete features in v4.7.3.
Is there something I can to fix this issue for myself locally, while we wait for v4.7.3 to be released publicly?

Thanks,
Harsh.

[Ericgig]

v4.7.5 was released a few weeks ago.
It's available on both conda and pypi.

[HarshBabla99]

Thanks