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How to permenantly set PYTHONPATH for 2.6 and 3.0?

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How to permenantly set PYTHONPATH for 2.6 and 3.0?

 
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  #1
Oct 26th, 2009
So I did some research and learn that you use the sys module to set the path for 2.5:

import sys
sys.path.append('usr/local/lib/python2.5/site-packages/')

And that would set the path for 2.5 permanently, but if i do the samething for 2.6 or 3.0, it will not work the next time I open the interpreter.

I thought this path was suppose to be set by default. it's not so i'm trying to set it.

help please
thanks
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Oct 26th, 2009
You can get the path to the site-packages directory like this
python Syntax (Toggle Plain Text) 
  1. >>> import os
  2. >>> os.path.join(os.path.split(os.__file__)[0], "site-packages")
  3. '/usr/lib64/python2.6/site-packages'
With python 3:
python Syntax (Toggle Plain Text) 
  1. >>> import os                                                   
  2. >>> os.path.join(os.path.split(os.__file__)[0], "site-packages")
  3. '/usr/local/lib/python3.1/site-packages'
(on the same machine).

However, you shouldn't normally need to put the site-packages in sys.path yourself. I'd like to see the value of your sys.path just after you start python.
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Oct 26th, 2009
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Originally Posted by Gribouillis View Post
You can get the path to the site-packages directory like this
python Syntax (Toggle Plain Text) 
  1. >>> import os
  2. >>> os.path.join(os.path.split(os.__file__)[0], "site-packages")
  3. '/usr/lib64/python2.6/site-packages'
With python 3:
python Syntax (Toggle Plain Text) 
  1. >>> import os                                                   
  2. >>> os.path.join(os.path.split(os.__file__)[0], "site-packages")
  3. '/usr/local/lib/python3.1/site-packages'
(on the same machine).

However, you shouldn't normally need to put the site-packages in sys.path yourself. I'd like to see the value of your sys.path just after you start python.
Doesn't even work temporarily.

"No module name file.py" after i did what you wrote and attempted to image a module
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  #4
Oct 27th, 2009
What I wrote doesn't do anything, it only computes the path to site-packages.
What you should do is paste your sys.path here (before you do anything with it).
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Oct 27th, 2009
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Originally Posted by Gribouillis View Post
What you should do is paste your sys.path here (before you do anything with it).
What do you mean by that? where is here?
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  #6
Oct 27th, 2009
What Gribouillis means is run this code and post the output here on DaniWeb ...
python Syntax (Toggle Plain Text) 
  1. # show the system path for Python ( PYTHONPATH )
  2.  
  3. import sys
  4. print( sys.path )
You need to run this with the version of Python you are interested in.

Also you cannot permanently set PYTHONPATH as it includes information about the current file you are working with.
Last edited by vegaseat; Oct 27th, 2009 at 4:02 pm. Reason: this
May 'the Google' be with you!
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  #7
Oct 27th, 2009
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I thought this path was suppose to be set by default. it's not so i'm trying to set it.
You can modify it on startup by adding PYTHONPATH to your ~/.bash.rc file, or create one if you don't have it.
export PYTHONPATH=$PYTHONPATH:/path/to/add:/second/path
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  #8
Oct 27th, 2009
>>> import sys
>>> sys.path
['/home/junlue', '/usr/bin', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages/PIL', '/usr/lib/python2.6/dist-packages/gst-0.10', '/var/lib/python-support/python2.6', '/usr/lib/python2.6/dist-packages/gtk-2.0', '/var/lib/python-support/python2.6/gtk-2.0', '/usr/local/lib/python2.6/dist-packages']


This is what i got. no site-pakcages though
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  #9
Oct 27th, 2009
I suggest that you write a module
python Syntax (Toggle Plain Text) 
  1. # mystartup.py
  2. import os, sys
  3. site_packages = os.path.join(os.path.split(os.__file__)[0], "site-packages")
  4. sys.path.append(site_packages)
and put this module somewhere on your python path. Then when you write a python program, you simply put
python Syntax (Toggle Plain Text) 
  1. # at the top of your main program
  2. import mystartup
This should work even if you have different versions of python.
Last edited by Gribouillis; Oct 27th, 2009 at 7:44 pm.
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Get site-packages path

 
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  #10
33 Days Ago
It's quicker to get the path to site-packages right from the command line:
Python Syntax (Toggle Plain Text) 
  1. python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()"
Last edited by prouty; 33 Days Ago at 1:28 pm. Reason: needed [code]
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