module compiled against API version 8 but this version of numpy is 7

[nitraat]

After upgrading to pandas 0.11.0 using pip, I get the following errors:

In [1]: import pandas
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
RuntimeError: module compiled against API version 8 but this version of numpy is 7
numpy.core.multiarray failed to import
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-d6ac987968b6> in <module>()
----> 1 import pandas

/usr/local/lib/python2.7/site-packages/pandas/__init__.py in <module>()
      4 
      5 try:
----> 6     from . import hashtable, tslib, lib
      7 except Exception:  # pragma: no cover
      8     import sys

ImportError: numpy.core.multiarray failed to import

I have numpy version 1.7.1, running OS X 10.8.3
Installing pandas on an empty virtualenv failed due to a numpy dependency which couldn't install automatically, however, after installing numpy explicitly, it did work. Is this a bug or is something just messed up with my install?

[ghost]

0.11.0 now imports numexpr if it's available, try reinstalling/recompiling that
against your current numpy and see if the error goes away.

[nitraat]

Reinstalled numexpr, which imports fine on its own, but the problem still persists.

[ghost]

Can you elaborate on "failed due to a numpy dependency which couldn't install automatically",
what went wrong?

[ghost]

I would guess you compiled numpy from git master, without resetting to the 1.7 maintenance branch.
try "git reset --hard v1.7.1" , reinstall numpy, and pandas and hopefully the issue will be resolved.

[nitraat]

Can you elaborate on "failed due to a numpy dependency which couldn't install automatically",
what went wrong?

When I used pip install pandas, it tried to install numpy as well since it's a dependency, however, that build seemed to fail. When I subsequently issued pip install numpy, numpy did install correctly. I unfortunately lost the pip.log, though I can probably reproduce it if needed.

I would guess you compiled numpy from git master, without resetting to the 1.7 maintenance branch.
try "git reset --hard v1.7.1" , reinstall numpy, and pandas and hopefully the issue will be resolved.

This fixed the problem. Thanks a bunch!

[vfilimonov]

I have the same issue. Both installations of numpy with pip install numpy and git clone https://github.com/numpy/numpy.git (together with git reset --hard v1.7.1 and then build/install) do not help - on import pandas I get the same error as the topic starter.

OSX 10.8.3
numpy: 1.7.1
python: 2.7.2
pandas: 0.11.0 (installed with pip)

I would appreciate any help with this.

[ghost]

can you try that in a venv and see if it makes a difference? it's hard to tell
what goes on in the global site-packages sometime.

[vfilimonov]

It was within some virtualenv, but it seemed that quite messy one.
Within a clean virtualenv everything worked perfectly! y-p, thank you very much for the advice!

p.s. I installed packages in the following order:

pip install numpy
pip install scipy
pip install pandas