Can't install numpy after a pip upgrade

Question

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/base_command.py", line 176, in main
    status = self.run(options, args)
  File "/home/me/.venvs/_/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 346, in run
    session=session, autobuilding=True
  File "/home/me/.venvs/_/lib/python3.6/site-packages/pip/_internal/wheel.py", line 848, in build
    assert building_is_possible
AssertionError

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

UPD 0

pip install numpy --no-cache -v

gives this tremendous output

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

Also pass ***-v*** (verbose) arg to *pip*, to get more output. — CristiFati, Jan 23 '19 at 11:49
Try downloading the wheel file of numpy and installing from that, there also use the -v flag if it fails. — anand_v.singh, Jan 23 '19 at 12:40

newkid · Accepted Answer · 2019-01-23T14:16:26.383

9

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.

edited Jan 23 '19 at 14:16

answered Jan 23 '19 at 12:28

newkid

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Should I issue a bugreport? – Montreal Jan 23 '19 at 13:49
1

Yes you can. From the error message it is clear that numpy fails the `build_is_possible` assertion in `wheel.py` so it is a bug. – newkid Jan 23 '19 at 13:53
1

Pip 19.0.1 was just released to fix this – frmdstryr Jan 23 '19 at 14:13

Can't install numpy after a pip upgrade

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