"KeyError: 'PYTHONPATH'" message when updating Anaconda packahes on Mac OS X

Question

Each time I try to update my Anaconda (version 3.15.1) packages on my Mac (OS X 10.10.4), I get the following message:

Error in sitecustomize; set PYTHONVERBOSE for traceback: KeyError: 'PYTHONPATH'

The rest of the updating process seems to run normally, but I'd like to figure out what causes this message and how to remove it.

Answer 1

Set the PYTHONVERBOSE environment variable as suggested by the error message:

PYTHONVERBOSE=1 conda update --all

That should give you a full traceback, which should tell you what file that error is coming from.