python commands strange behavior inside vim

Hello all

i'm work now with third party django library for python. There are
happens one strange moment concern pythoncomplete from the vim73 box
which i try to understand.
when i want to use pythoncomplete for django modules, inside vim, i
must add some project variables:

i do following :
python import sys,os
python sys.path.append('D:/workspace/django/create_web_app_with_py')
python os.environ['DJANGO_SETTINGS_MODULE'] = 'mysite.settings'

then, i open file with some django code and press after models <C-X><C-
O>
#--------
...
from django.db import models

models.<C-X><C-O> #worked fine!
...

...
#-------

In this case, omnifunction work perfect.

But, after restart of vim, if i would like to do the same, but little
bit in differ manner, it's not work.
1) open file with django code
2) after 'models.' block push <C-X><C-O> # variables not set,
autocomplete not work, it's ok!
3) set python variables
4) do step 2), # autocomplete not work! :(

could somebody explain what's happens?

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