easy_install conflict for python2.4 and python2.7
Question: I have installed python under /opt/python2.7.1/ on CentOS machine which has
already python2.4 and configure it to run python2.7 default.

However, when I write 'easy_install' it raises error like

    
    
    Traceback (most recent call last):
        File "/opt/python2.7.1/bin/easy_install", line 5, in ?
            from pkg_resources import load_entry_point
        File "/usr/lib/python2.4/site-packages/pkg_resources.py", line 2482, in ?
            for dist in working_set.resolve(
        File "/usr/lib/python2.4/site-packages/pkg_resources.py", line 483, in resolve
            raise DistributionNotFound(req)  # XXX put more info here
        pkg_resources.DistributionNotFound: setuptools==0.6c11
    

I think `easy_install` under `/usr/bin/` links to python2.4. How can I run
`/opt/python2.7.1/bin/easy_install` default?

For $PATH:

    
    
    /opt/python2.7.1/bin:/usr/devs/bin:/usr/local/bin:/bin:/usr/bin:/home/ops/bin
    

For $LD_LIBRARY_PATH:

    
    
    /opt/python2.7.1/lib:
    

For easy_install:

    
    
    Traceback (most recent call last):
    File "/opt/python2.7.1/bin/easy_install", line 5, in ?
        from pkg_resources import load_entry_point
    File "/usr/lib/python2.4/site-packages/pkg_resources.py", line 2482, in ?
        for dist in working_set.resolve(
    File "/usr/lib/python2.4/site-packages/pkg_resources.py", line 483, in resolve
        raise DistributionNotFound(req)  # XXX put more info here
    pkg_resources.DistributionNotFound: setuptools==0.6c11
    


Answer: You have to make use of
[virtualenv](http://www.virtualenv.org/en/latest/index.html) to get things
working properly, and without worries in systems with more than one Python
version.

Actually, it is quite a help even in system qwith a single Python version, if
you have muliple Python apps running.

Visrtualenv will not only take care of setting up all the appropriate
environment variables for you to use one Python or another, as it will allow
you to use use a separate environment where you can safely "easy_install"
Python 2.4 modules without conflicting with CentOS .rpm packages of those same
modules.

