[SOLVED] How to use $PYTHONPATH

chris_crunch · 03-04-2016, 03:17 AM

I've continually searched this on google but I'm unable to get the full picture behind whats going on (I'm quite technically illiterate, still learning...)

I have a software program called caffe. It says:

Add the module directory to your $PYTHONPATH by export PYTHONPATH=/path/to/caffe/python:$PYTHONPATH or the like for import caffe.

But I keep encountering issues with his.

Code:

chris@chris-crunch:~/apps/caffe-master/python/caffe$ python
Python 2.7.11 |Anaconda 2.5.0 (64-bit)| (default, Dec  6 2015, 18:08:32) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Anaconda is brought to you by Continuum Analytics.
Please check out: http://continuum.io/thanks and https://anaconda.org
>>> import caffe
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named caffe

Wehhh. Why is this happening? I thought I did everything right but can someone shed light on this to help me out?

pan64 · 03-04-2016, 04:19 AM

did you add that path to PYTHONPATH? How?

chris_crunch · 03-04-2016, 08:27 AM

I tried this

Code:

 
>>> import sys
>>> sys.path.append('home/chris/apps/caffe-master/python/caffe/pycaffe.py')
>>> import caffe
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named caffe

pan64 · 03-04-2016, 11:10 AM

probably:
sys.path.append('/home/chris/apps/caffe-master/python/caffe')
will help

aragorn2101 · 03-05-2016, 04:13 AM

Hello there,

PYTHONPATH is a Bash variable which will be passed to Python once it is called. Consequently, when you will import something from inside Python, it will look into that path. So, you have to change the variable before calling python, at the Bash prompt itself:

(displays content of your actual PYTHONPATH variable)
echo $PYTHONPATH

export PYTHONPATH=home/chris/apps/caffe-master/python/caffe:$PYTHONPATH

(now you must see the modifications you have brought)
echo $PYTHONPATH

Cheers.