ImportError: No module named '_cffi_backend' Reproducible: Always
Created attachment 450948 [details] build.log
Created attachment 450950 [details] emerge --info
It seems that your cffi installation is broken, can you list the output of qlist dev-python/cffi and the build.log of emerge dev-python/cffi ? Also, you uploaded your build.log instead of emerge --info
My dev-python/cffi installation was broken for no reason, reinstalled and dev-python/cryptography installed with no problem.
I had exactly the same problem. But re-emerging dev-python/cffi fixed it here as well.