New submission from Etienne Fortin:
The pywin32 package use imp.load_dynamic() to load a DLL with Windows specific
type. On Python 3.4+ imp.load_dynamic() point to the following code which use
the newer importlib module:
import importlib.machinery
loader = importlib.machinery.ExtensionFileLoader(name, path)
return loader.load_module()
In pywin32 a mechanism is used to be able to have part of a module globals
defined in python (pywintypes.py), and the reminder in a DLL
(pywintypesXX.dll). The code in pywin32 between 3.4 and 3.5 is the same.
In Python 3.4, calling imp.load_dynamic(), which point to the code above,
inside the python part of the module definition loads the types defined in the
DLL.
In Python 3.5, calling imp.load_dynamic(), which also points to the code above,
inside the python part of the module definition reloads the same python module,
not the DLL. Even though a path to a DLL is given AND when doing introspection
of the module it clearly points to the specified DLL.
This is a change of behavior that breaks pywin32, but possibly other modules
that rely on this behavior.
----------
components: Extension Modules, Windows
files: pywintypes.py
messages: 247573
nosy: ebfortin, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Change of behavior for importlib between 3.4 and 3.5 with DLL loading
type: behavior
versions: Python 3.5
Added file: http://bugs.python.org/file40055/pywintypes.py
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<http://bugs.python.org/issue24748>
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