polib allows you to manipulate, create, modify gettext catalogs (.pot, .po and binary .mo files). You can load existing files, iterate through it's entries, add, modify entries, comments or metadata, etc... or create new po/pot files from scratch.

polib provides a simple and pythonic API, exporting only two convenience functions 'pofile' and 'mofile', and the 4 core classes: POFile, MOFile, POEntry and MOEntry for creating new files/entries.