Use the Ironpython standard Modules (and load other modules)

[meinname]

to have the default modules of ironpython available put the content of https://github.com/IronLanguages/ironpython2/releases/download/ipy-2.7.9/IronPython.StdLib.2.7.9.zip to a new folder named "src" inside your OB folder
maybe add other modules you need too
and import stuff inside your python script

import sys
sys.path.append('./src')

and then you can import the usual way for example like

from binascii import b2a_hex

Of course you can copy other modules into the src folder to be able to import them