2010/10/22 Stefan Behnel <stefan...@behnel.de>: > Benjamin Peterson, 22.10.2010 16:03: >> >> 2010/10/22 Stefan Behnel: >>> >>> since SVN rev. 85392, Cython's installation fails on the py3k branch with >>> a >>> weird globals error. I think it is related to some sys.modules magic that >>> we >>> do in order to support running Cython in Python 3 using lib2to3. >>> >>> Basically, what we do is, we import some parts of Cython at the beginning >>> that are Py3 clean, specifically some distutils build_ext replacement for >>> building Cython modules. Then we start up distutils, which first runs >>> lib2to3 on Cython's sources to convert them into Py3 code. When it then >>> gets >>> to building the binary modules, we remove all Cython modules and packages >>> from sys.modules and reimport their 2to3-ed sources so that we can run >>> the >>> complete compiler during the installation (to bootstrap parts of Cython >>> into >>> binary modules). >>> >>> Since the above revision, this process bails out with an error when >>> accessing "os.path" because "os" is None. The "os" module is imported >>> globally in our early-imported build_ext module, more or less like this: >>> >>> import os >>> >>> from distutils.command import build_ext as _build_ext >>> >>> class build_ext(_build_ext.build_ext): >>> >>> def build_extensions(self): >>> print(os) # prints None! >>> >>> I suspect that the fact that we remove the modules from sys.modules >>> somehow >>> triggers the cleanup of these modules while there are still objects from >>> these modules alive that refer to their globals. So, what I think is >>> happening is that the module cleanup sets the module's globals to None >>> before the objects from that module that refer to these globals have >>> actually gone out of scope. >>> >>> Could someone (benjamin?) please look into this? >> >> Is this broken before 2.7, ie 2.6 and 2.6? > > I can't tell. Py2 doesn't need 2to3, so we don't unload the modules there.
What about 3.1.0 then? -- Regards, Benjamin _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
