How to successfully import numpy using Python 3.x?

Question

Similar to How to import numpy in python shell, but with different errors and context.

Now, on to the problem. I successfully installed numpy 1.7.0 with minor hassle, although I had to do some registry editions first, but upon trying to import it in the shell I get this mass of errors:

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    from numpy import *
  File "C:\Python32\lib\site-packages\numpy\__init__.py", line 137, in <module>
    from . import add_newdocs
  File "C:\Python32\lib\site-packages\numpy\add_newdocs.py", line 9, in <module>
    from numpy.lib import add_newdoc
  File "C:\Python32\lib\site-packages\numpy\lib\__init__.py", line 4, in <module>
    from .type_check import *
  File "C:\Python32\lib\site-packages\numpy\lib\type_check.py", line 8, in <module>
    import numpy.core.numeric as _nx
  File "C:\Python32\lib\site-packages\numpy\core\__init__.py", line 5, in <module>
    from . import multiarray
ImportError: DLL load failed: %1 is not a valid Win32 application.

Note: I used from numpy import *. Nothing like this happens when I import pygame, so what's the problem? I know different modules have different problems (such as having to make registry editions in order to install...). What is wrong and how do I fix the problem? I found similar complaints here.

Did you install from an .exe installer on SourceForge? I don't see one for 1.7.0 numpy. Could you be using the wrong installer? If building yourself, the error indicates it was a 64-bit build and using 32-bit Python. I used the 1.6.2 installer on Python 3.2 with no problems or hacks. — Mark Tolonen
– Mark Tolonen, Commented Aug 16, 2012 at 2:14
I got mine from here: sourceforge.net/projects/numpy/files/NumPy/1.7.0beta/…. If this doesn't work out I'll try 1.6.2. — Stumbleine75
– Stumbleine75, Commented Aug 16, 2012 at 2:23
My bad, I didn't see the 3.2 version at first. It should "just work" like the 1.6.2 version did for me. There are no 64-bit installers, though. Are you using a 64-bit Python install? The error message still indicates a DLL isn't the right type. — Mark Tolonen
– Mark Tolonen, Commented Aug 16, 2012 at 2:43
If you're asking about what Version of python I installed, I think I installed the 64-bit version. However, I've been under the impression that 32-bit modules should work with 64-bit python (right? I don't know for sure, it's pure speculation). Anyway, I installed 1.6.2 and tried to import to no avail. However, I did not get rid of 1.7.0 as I don't see an unistall option. — Stumbleine75
– Stumbleine75, Commented Aug 16, 2012 at 2:48
No, if you have the 64-bit Python you need 64-bit extensions. You can run 32-bit Python with 32-bit extensions on 64-bit Windows, though. — Mark Tolonen
– Mark Tolonen, Commented Aug 16, 2012 at 6:47

casevh · Accepted Answer · 2012-08-16 03:12:52Z

3

You have a 32 vs 64-bit mismatch between Python and numpy. If you are using a 32-bit version of Python, you must use a 32-bit version of any pre-compiled DLLs. 64-bit versions of Python require a 64-bit version of a library that includes pre-compiled DLLs.

Pure Python libraries aren't impacted but any library that includes compiled code must match must match Python itself.

answered Aug 16, 2012 at 3:12

casevh

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3 Comments

Stumbleine75 Over a year ago

This is late, but what should I do then? I installed 1.6.2 but still got the error upon importing numpy. Do I have to get another version of Python because there's only one numpy 1.6.2 for Python 3.2?

casevh Over a year ago

You have two choices. To use the official numpy binaries, you'll need to install a 32-bit version of Python. This will limit you memory usage to ~2GB. If you want to stay with a 64-bit version of Python, I would try the numpy binaries available at http://www.lfd.uci.edu/~gohlke/pythonlibs/

Stumbleine75 Over a year ago

Thank you very much, I downloaded and installed the 64 bit numpy MKL 1.6.2 file and I now get no errors when importing numpy.

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