Can't install numpy after a pip upgrade

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For some reason, after pip is upgraded to version 19.0, I'm not able to install the most recent version of numpy (it still perfectly works with pip version 18.1).

When I run

pip install numpy --no-cache 

I get this exception

Exception: Traceback (most recent call last):   File "/home/me/.venvs/_/lib/python3.6/site-packages/pip/_internal/cli/", line 176, in main     status =, args)   File "/home/me/.venvs/_/lib/python3.6/site-packages/pip/_internal/commands/", line 346, in run     session=session, autobuilding=True   File "/home/me/.venvs/_/lib/python3.6/site-packages/pip/_internal/", line 848, in build     assert building_is_possible AssertionError 

I'm also using python version 3.6, and virtualenvwrapper version 16.0.0.


pip install numpy --no-cache -v 

gives this tremendous output

UPD 1 I've opened a bug request on the numpy issue tracker.


That is because pip v19.0 was released yesterday and the latest push to the numpy git rep was 10 days ago. I think we have to wait for an update to be compatible with pip v19.0.

Edit 1: Based on @frmdstryr comment, pip v19.0.1 has been released to fix this.


:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen: