[docs] [issue14597] Cannot unload dll in ctypes until script exits

[Mark Mikofski]

Mark Mikofski added the comment:

Snippets of "proprietary" code

`setup.py`
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# run clean or build libraries if they don't exist
if 'clean' in sys.argv:
    try:
        os.remove(os.path.join(LIB_DIR, SOLPOSAM_LIB_FILE))
        os.remove(os.path.join(LIB_DIR, SPECTRL2_LIB_FILE))
    except OSError as err:
        sys.stderr.write('%s\n' % err)

`core.py`
---------
    # load the DLL
    solposAM_dll = ctypes.cdll.LoadLibrary(SOLPOSAMDLL)
    _solposAM = solposAM_dll.solposAM

After deleting files, setup.py tries to build, then runs test_cdlls.py a unittest that contains test_solposAM() that calls solposAM() and imports core.py that contains solposAM.

Case 1:
-------
I put the load library calls inside the function solposAM().
Function calls works as expected.
I am able to delete dlls after interpreter exits and restarts using os.remove()

Case 2:
-------
I put the load library calls at the module level.
Function calls works as expected.
If I try to delete dlls after interpreter exits and restarts using os.remove() I get access denied, but I can delete them from windows explorer.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14597>
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