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Ubuntu add directory to Python path

I want to run third part tool written in python on my ubuntu machine (corgy tool).

However I don't know how to add additional modules to Python path. 

cat doc/download.rst         
There is currently no setup.py, so you need to manually add
the download directory to your PYTHON_PATH environment variable.

How can I add directory to PYTHON_PATH?

I have tried:
export PYTHON_PATH=/home/user/directory:$PYTHON_PATH && source .bashrc
export PATH=/home/user/directory:$PATH && source .bashrc

python
import sys
sys.path.append("/home/user/directory/")

But when I try to run this tool I get: 

Traceback (most recent call last):
File "examples/dotbracket_to_bulge_graph.py", line 4, in <module>
import corgy.graph.bulge_graph as cgb
ImportError: No module named corgy.graph.bulge_graph
Solution

  • Create a .bash_profile in your home directory. Then, add the line

    PYTHONPATH=$PYTHONPATH:new_dir
EXPORT $PYTHONPATH

    Or even better:

    if [ -d "new_dir" ] ; then
  PYTHONPATH="$PYTHONPATH:new_dir"
fi
EXPORT $PYTHONPATH

    The .bash_profile properties are loaded every time you log in.

    The source command is useful if you don't want to log in again.