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. Stefan
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