I ask this question in the context of most other questions being 5-10 years old on this topic and given the following
- Windows 7 OS
- Several versions of a
.pydcompiled dll at different file path locations e.g./ver1.0/lib/my_dll.pyd/ver1.1/lib/my_dll.pyd
my_dll.pydis imported from a secondary file asfrom my_dll import *, I am not in control of the method or at liberty to alter
I can successfully switch between two .pyd versions as follows
import sys
sys.path.append(r'\path\to\ver_1.0')
import my_dll # imports ver 1.0
print my_dll.release_version()
sys.path.pop(-1)
del sys.modules['my_dll'] # remove module dict ref
from IPython import get_ipython # just in case you run in iPython
get_ipython().magic('reset -sf') # need to remove history!
del my_dll # delete the import object
import _ctypes # release the library handle
import ctypes
dll = ctypes.CDLL('my_dll.pyd')
_ctypes.FreeLibrary(dll._handle) # for some reason it needs to be
_ctypes.FreeLibrary(dll._handle) # done twice.
sys.path.append(r'\path\to\ver_1.1')
import my_dll
print my_dll.release_version()
The failures of reload are overcome by reloading the C++ .pyd as per the following output
Version 1.0
Version 1.1
my issue is that then I am left with an extremely flimbsy python ecosystem that will crash at almost any new function call.
Is there a more updated methodology of doing this?