When I imported the olca2bw module using pyton, I encountered a bug and didn't know how to fix it

Question

All my modules are version compliant

import openlca2bw as olca2bw

import brightway2 as bw

ImportError: cannot import name 'EXISTING_SYMBOLS' from 'bw2parameters.utils' (d:\python\lib\site-packages\bw2parameters\utils.py)

Answer 1

Hi honortao666,

Are you trying to run this script in the openLCA Python editor?

I believe people developing olca2bw might be better suited to help you.

Best,

François

Comments

You could find some outdated examples here: https://greendelta.github.io/openLCAJython-manual/examples.html.
We are working on a new version of the manual. It should be released in the first half of next year.

Answer 2

Hi, I encountered the same issue. For me, the solution was to make sure I was using Python 3.8 rather than a later version and ensuring that some Brightway-related packages matched the requirements from openlca2bw. Immediately after creating a new virtual environment and only installing openlca2bw via pip, for some reason the wrong package versions of bw2io and bw2parameters were installed.

So for me, the complete installation was:

(creating virtual environment)
pip install openlca2bw
pip install bw2io<0.8.9
pip install bw2parameters==0.6.6

After that, it worked for me :)

Best,
Maria