ImportError: C extension: numpy.core.multiarray failed to import not built.

[maestropandy]

When I am installing devstack-single node openstack package, It needs pandas, while installing facing error as below

ImportError: C extension: numpy.core.multiarray failed to import not built. If you want to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace --force' to build the C extensions first.

If do manual installation of pandas by using "python setup.py build_ext --inplace --force" from source its running fine, but cannot instruct other dependencies software to clone and do it forcefully.

it will be good if installed normally than force inplace

[maestropandy]

Here is the call from openstack script to install numpy

`# numpy compat
from pandas.compat.numpy import *

try:
from pandas._libs import (hashtable as _hashtable,
lib as _lib,
tslib as _tslib)
except ImportError as e: # pragma: no cover
# hack but overkill to use re
module = str(e).replace('cannot import name ', '')
raise ImportError("C extension: {0} not built. If you want to import "
"pandas from the source directory, you may need to run "
"'python setup.py build_ext --inplace --force' to build "
"the C extensions first.".format(module))
`

[gfyoung]

@maestropandy : Thanks for reporting this! Looks like a numpy issue though IIUC. Not sure how pandas would help you out here? (numpy packages are failing to be built)

[TomAugspurger]

@maestropandy for us to help, you'll need to provide more info on how you're installing things.

[samlcharreyron]

I have the same issue on OSX Sierra when using homebrew python and numpy and installing pandas via pip. After a bit more research it seems like I was having this issue.

#18530

[jorisvandenbossche]

Yes, this is an issue with the wheels hosted on PyPI for 0.21.0 (our bad). You can pip install a new version of the wheels with the command specified here: #18530 (comment)

Closing this as it is covered by #18530