Python installation error: NumPy package

Question

I am trying to follow this tutorial and getting an error when I do the following:

(DataVizProject) $ pip install -r requirements.txt

It gives me a big error log, the last few lines of which are :

C:\python\new-coder\dataviz\DataVizProj\build\numpy\numpy\distutils\system_info.
py:1422: UserWarning:

    Lapack (http://www.netlib.org/lapack/) sources not found.

    Directories to search for the sources can be specified in the

    numpy/distutils/site.cfg file (section [lapack_src]) or by setting

    the LAPACK_SRC environment variable.

  warnings.warn(LapackSrcNotFoundError.__doc__)

error: Unable to find vcvarsall.bat

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in C:\python\new-coder
\dataviz\DataVizProj\build\numpy

I know it doesn't work because when I do the following steps:

>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named numpy
>>> import matplotlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named matplotlib
>>>

Thanks a lot!

Why don't you read the error message? "Lapack (netlib.org/lapack) sources not found.". Install Lapack and you'll probably be fine. — tamasgal
– tamasgal, Commented Sep 10, 2013 at 23:48
Your other issue (unable to find vcvarsall.bat) has also been addressed before on this site, many times. Depending on the exact root cause, you may be able to find help here, here, here, or here... — Mac
– Mac, Commented Sep 10, 2013 at 23:59

Fernando Freitas Alves · Accepted Answer · 2013-09-11 04:08:30Z

5

@Hasnain, when you are using python in windows, eventually you will see this error for some packages.

You have three options when it happen (in order of relevance):

1 - Try to download a MSI file. It will install the library without any problems. To numpy specifically you can download here (http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy)

2 - You can download the whole file and try a python setup.py install and modify the packacge if it raise some errors.

3 - You can compile your own library for your operational system.

Many MSI files you can find here (http://www.lfd.uci.edu/~gohlke/pythonlibs/)

answered Sep 11, 2013 at 4:08

Fernando Freitas Alves

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Comments

elyase · Accepted Answer · 2013-09-12 06:42:30Z

2

The method recommended in that tutorial works well for Unix systems. If you are on Windows you will go through a lot of trouble trying to build numpy from sources with pip. I will save you some time, follow the official recomendation and try some binary install of the recommended ones in the official Scipy website. I personally recommend you the Anaconda or the Enthought distribution.

edited Sep 12, 2013 at 6:42

answered Sep 10, 2013 at 23:51

elyase

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1 Comment

John Lyon Over a year ago

This is my go to for Windows binary builds, it's a godsend: lfd.uci.edu/~gohlke/pythonlibs

Alexander · Accepted Answer · 2013-09-12 08:07:23Z

1

Usually when installing packages on windows, by default python searches for Visual Studio 2008 . You can either install it or use MinGW Compiler.

If you decide to use MinGW you should edit your distutils.cfg file in Python27\Lib\distutils directory :

[build]
compiler = mingw32

[build_ext]
compiler = mingw32

answered Sep 12, 2013 at 8:07

Alexander

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1 Comment

LukeS Over a year ago

I do not have a distutils.cfg file in my C:\Python27\Lib\distutils folder?

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