Import of egg packages installed with easy_install

Diez B. Roggisch deets at nospam.web.de
Mon Dec 1 20:09:29 CET 2008


Alexey Vlasov wrote:

> Hi.
> 
> There's an already installed with easy_install packet, let's say flup,
> to the home catalog:
> $ ls -la ~/python/lib/python2.5/site-packages/
> total 176
> drwxr-xr-x  3 4096 Nov 29 18:57 .
> drwxr-xr-x  3 4096 Nov 29 18:51 ..
> -rw-r--r--  1 208 Nov 29 18:57 easy-install.pth
> -rw-r--r--  1 134573 Nov 29 18:51 flup-1.0.1-py2.5.egg
> -rw-r--r--  1 2362 Nov 29 18:51 site.py
> -rw-r--r--  1 1853 Nov 29 18:51 site.pyc
> 
> 
> $ cat ~/python/lib/python2.5/site-packages/easy-install.pth
> import sys; sys.__plen = len(sys.path)
> ./flup-1.0.1-py2.5.egg
> import sys; new=sys.path[sys.__plen:]; del sys.path[sys.__plen:];
> p=getattr(sys,'__egginsert',0); sys.path[p:p]=new; sys.__egginsert =
> p+len(new)
> 
> $ echo $PYTHONPATH
> /usr/lib64/portage/pym:/home/username/python/lib64/python2.5/site-packages
> 
> $ python
> Python 2.5.2 (r252:60911, Nov 13 2008, 15:01:36)
> [GCC 4.1.2 (Gentoo 4.1.2 p1.1)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import flup
> 
> No errors.
> 
> Then I create a simple CGI script:
> ========
> #!/usr/bin/python
> 
> print "Content-type: text/plain";
> print
> 
> import sys
> sys.path.insert (0,
> '/home/username/python/lib64/python2.5/site-packages')
> print sys.path
> import flup
> ========
> 
> Browser says:
> ['/home/username/python/lib64/python2.5/site-packages',
> '/home/username/http', '/usr/lib64/python25.zip',
> '/usr/lib64/python2.5', '/usr/lib64/python2.5/plat-linux2',
> '/usr/lib64/python2.5/lib-tk', '/usr/lib64/python2.5/lib-dynload',
> '/usr/lib64/python2.5/site-packages']
> 
> in error log:
> [Sat Nov 29 19:41:15 2008] [error] Traceback (most recent call last):
> [Sat Nov 29 19:41:15 2008] [error] File "path.cgi", line 9, in <module>
> [Sat Nov 29 19:41:15 2008] [error] import flup
> [Sat Nov 29 19:41:15 2008] [error] ImportError: No module named flup
> 
> 
> If you start it with console, you get the same, but there appears also
> another path:
> /home/username/python/lib64/python2.5/site-packages/flup-1.0.1-py2.5.egg
> 
> As I understand it is the problem actually, but I can't get why sys.path
> doesn't contain this path when I request with HTTP.

It's not sufficient to add simply your local site-packages, you must install
it using the module site's addsitedir-function, like this:

import site
site.addsitedir("/home/username/python/lib/python2.5/site-packages")

The reason is that otherwise the *.pth-files in the site-packages aren't
picked up.

Diez




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