create a directory structure

[Andrea Crotti]

I would like to write a program which creates a directory structure and
fills in a few templated fields some values passed in as arguments.

So for example
create_struct.py

might create
base_dir:
|_ sub_dir1:
|_ sub_file1
....

It's quite simple in theory, but I would also like to make it very
easily maintanable, for example with a nice representation of the
structure (an INI file maybe).

Any ideas/advise on how to make it easy to write and to maintain?