Need help on left padding

[rajesh kataraki]

Hello,

     My requirement is I am using one variable ex. var = 5 which is
integer.
    And this variable, I m using in some string. But I want this var
to be used as 005 again integer in this string.

     The snippet of string is as follows:

     container_name = "%s-%d-dso-%s.so" % (platform_affix,var, rteset)


     Please let me know how can I implement this efficiently in python
language.

Need help urgent.

Thanks,
-Rajesh