Windows install issue - ImportError: No module named bw2data

[Jim Levis]

I'm really interested in trying out Brightway2 for LCA work, but I've had an installation issue that I'm unable to resolve. 

I'm running Windows 7, and I successfully ran 

pip install brightway2

When I rerun it, it just says all of the requirements are already satisfied.

But, when I run 

bw2-web.py

it says

ImportError: No module named bw2data

But there is a bw2data folder in my Canopy site-packages folder.

It's probably some novice Python package issue (I don't have a lot of experience with these types of intalls). But any advice you could give me would be really appreciated.

Best,

Jim

[Jim Levis]

Additionally if I call pip freeze it shows bw2data==0.17 in the list. So I don't know why bw2-web.py can't find it.

[Christopher Mutel]

Jim-

Thanks for your question. Installation, especially on Windows, is definitely a pain point, and all the feedback I can get from Windows-people is appreciated.

I haven't heard about this problem from other people, but I will do my best.

It looks like there is a path problem. Somehow the Python interpreter that is called when you run bw2-web.py is not finding the canopy site-packages folder. If you know where the bw2-web.py script is, you could put the following lines at the very beginning of this file (right after the line that looks like "#!/usr/bin/env python"):

import sys

for line in sys.path:

    print line

This will at least tell you if the "bw2data" folder is available (the canopy site-packages folder should be listed)

You can also trying running bw2-web.py directly from the Python shell in the Canopy Editor with:

!bw2-web.py 

(This is because ipython allows shell commands prefixed with a "!". But this might not work on your machine.)

Do you have another python installation on your machine? This could also be causing a conflict.

I am currently at a conference, so have limited availability, but I will be back on Monday. If you still have problems maybe we can troubleshoot over a videochat.

Yours,

-Chris

--

############################

Chris Mutel

Ökologisches Systemdesign - Ecological Systems Design

Institut f.Umweltingenieurwissenschaften - Institute for Environmental Engineering

ETH Zürich

John-von-Neumann-Weg 9

HPZ E33

8093 Zürich

http://chris.mutel.org

Telefon: +41 44 633 71 45 - Fax: +41 44 633 10 61

############################

[Jim Levis]

Chris,

Thanks for the reply.

I'm pretty sure the issue is multiple installations. If I add the code to bw2-web.py and run it. I get this:

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\Scripts

C:\Python27\lib\site-packages\setuptools-3.5.1-py2.7.egg

C:\Windows\system32\python27.zip

C:\Python27\DLLs

C:\Python27\lib

C:\Python27\lib\plat-win

C:\Python27\lib\lib-tk

C:\Python27

C:\Python27\lib\site-packages

And the same error. But, if I just run

for line in sys.path:

    print line

in the Canopy editor I get this list: 

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\lib\site-packages\setuptools-3.5.1-py2.7.egg

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\Scripts\python27.zip

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64\DLLs

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64\lib

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64\lib\plat-win

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64\lib\lib-tk

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64

C:\Users\Jim\AppData\Local\Enthought\Canopy\User

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\lib\site-packages

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\lib\site-packages\PIL

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\lib\site-packages\win32

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\lib\site-packages\win32\lib

C:\Users\Jim\AppData\Local\Enthought\Canopy\User\lib\site-packages\Pythonwin

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64\lib\site-packages

C:\Users\Jim\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.4.0.1938.win-x86_64\lib\site-packages\IPython\extensions

Which is what I want. Should I uninstall Python2.7.6 and Canopy and then reinstall Canopy?

Best,

Jim