[Tutor] Installing Modules

[Nate Lastname]

Have you looked at help(sys)?  sys stores the PYTHONPATH variable.  Just run
>>> import sys
>>> help(sys)
at the python prompt.

On 1/18/12, Downey, Patrick <PDowney at urban.org> wrote:
> Hello,
>
> I'll start by saying that I have a math/stats background, not a computer
> science one. I've found lots of great material to help with Python
> programming, but have had a much harder time getting my head around setup
> issues, like installing modules.
>
> I'm currently running Python version 2.7 through IDLE on a Windows machine.
> I'm trying to use numpy and scipy. I downloaded both modules from the scipy
> website and unzipped the files into:
> C:\Python27\Lib\site-packages
>
> I try to load them using this at the beginning of my program.
> from numpy import *
> from scipy import *
>
> And I get this error:
> Traceback (most recent call last):
>   File "D:/Documents and Settings/pdowney/My Documents/Actual
> Projects/Foreclosures/Python/Program (1-18-12).py", line 3, in <module>
>     from scipy import *
> ImportError: No module named scipy
>
> Numpy loads just fine. Both are in the same folder. That is, there's a file
> called setup.py in the folder:
> C:\Python27\Lib\site-packages\numpy
>
> And also in the folder:
> C:\Python27\Lib\site-packages\scipy
>
> I don't understand what is being done differently between the two packages.
> According to Chapter 6 of the Python documentation, "When a module named
> spam is imported, the interpreter searches for a file named spam.py in the
> directory containing the input script and then in the list of directories
> specified by the environment variable PYTHONPATH." Unfortunately, I haven't
> figured out how to look at PYTHONPATH, so I don't know where it's looking.
>>>> print PYTHONPATH
> Traceback (most recent call last):
>   File "<pyshell#17>", line 1, in <module>
>     print PYTHONPATH
> NameError: name 'PYTHONPATH' is not defined
>
> Importantly, there is no file scipy.py in the scipy folder, as the
> documentation suggests there should be, but there's also no numpy.py in the
> numpy folder and that module loads successfully. Clearly I'm missing
> something in the setup of these modules. Any guidance would be greatly
> appreciated.
>
> Thank you,
> Mitch
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