PDF creation starting from TIFF files

[dix]

Hi to all,

I would like to know if anyone of you has already solved this need:
I have to code an open-source python application that takes as input several
tiff files and convert them in pdf format creating a single pdf file
(page1.tif, page2.tif, page3.tif,....pageN.tif into SingleDocument.pdf).
The conversion to pdf is not enough, I need only the combining of the N
files into a single pdf.
I would like to use just free tools and libraries.
Thank you very much for all the support!!

dix