In the future, please use WikiFormatting.
This issue has nothing to do with p5.18-image-exiftool. Python is not involved with that port.
$ port info --depends p5.18-image-exiftool
depends_build:
depends_run:
depends_fetch:
depends_lib: port:perl5.18
depends_extract:
Indeed the problem appears to be that you have an old port installed - you need to uninstall it.
---> py25-gtk is replaced by py25-pygtk
sudo port uninstall py25-gtk
Since Trac is not for tech support, follow-up on the Macports Users mailing list if you still need help.