if the py2.5 script is relatively stable, meaning you don't need to change it much or often, try turning it into a self contained executable and call that instead. There are two python-to-exe programs I see mentioned often: py2exe and pyinstaller. I've personally had the best luck with pyinstaller, though I never used it in a gis-inside-gis fashion such as you are attempting. There are some other py-to-exe's discussed here on Stack Overflow.

However responding to the problem which is driving you to use 2.5: I used python 2.6 with Arcgis 9.3 for a long time to good effect using the recipe at Can I use python 2.6 with ArcGIS 9.3?.

if the py2.5 script is relatively stable, meaning you don't need to change it much or often, try turning it into a self contained executable and call that instead. There are two python-to-exe programs I see mentioned often: py2exe and pyinstaller. I've personally had the best luck with pyinstaller, though I never used it in a gis-inside-gis fashion such as you are attempting. There are some other py-to-exe's discussed here on Stack Overflow.

However responding to the problem which is driving you to use 2.5: I used python 2.6 with Arcgis 9.3 for a long time to good effect using the recipe at Can I use python 2.6 with ArcGIS 9.3?.

if the py2.5 script is relatively stable, meaning you don't need to change it much or often, try turning it into a self contained executable and call that instead. There are two python-to-exe programs I see mentioned often: py2exe and pyinstaller. I've personally had the best luck with pyinstaller, though I never used it in a gis-inside-gis fashion such as you are attempting. There are some other py-to-exe's discussed here on Stack Overflow.

However responding to the problem which is driving you to use 2.5: I used python 2.6 with Arcgis 9.3 for a long time to good effect using the recipe at Can I use python 2.6 with ArcGIS 9.3?.

if the py2.5 script is relatively stable, meaning you don't need to change it much or often, try turning it into a self contained executable and call that instead. There are two python-to-exe programs I see mentioned often: py2exe and pyinstaller. I've personally had the best luck with pyinstaller, though I never used it in a gis-inside-gis fashion such as you are attempting. There are some other py-to-exe's discussed here on Stack Overflow.

However responding to the problem which is driving you to use 2.5: I used python 2.6 with Arcgis 9.3 for a long time to good effect using the recipe at Can I use python 2.6 with ArcGIS 9.3?.