I'm running into an issue with version 2018.10.9 of Pipenv. The import of backports.weakref in pipenv/vendor/vistir/backports/tempfile.py is failing. This causes an exception upon running/importing pipenv.
I can patch it by changing the import in pipenv/vendor/vistir/backports/tempfile.py to import from pipenv.vendor.backports.weakref. I can only reproduce the issue on my continuous integration setup though, not on my own machine. I can see that pipenv/init.py adds the vendor subpackage to sys.path, but this must not be doing the right thing for some reason on my CI virtual machine.
No exception when pipenv.vendor.vistir is imported.
File "c:\python27\lib\site-packages\pipenv\vendor\vistir_init_.py", line 4, in
Steps to replicate
I'm investigating this further, because I can not replicate it easily yet. I'll update the bug when I know more. Sorry for raising the bug already, I hadn't checked properly that I could replicate the problem easily.
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