By and large looks fine (I wrote FritzingCheckPart.py) It will not deal with .fzz files as they are sketches not parts and in a different format. It could (but currently doesn’t) unzip and process .fzpz files but not enough people use it to make further development worthwhile. Most people find part making too complex. This tutorial covers making parts if you haven’t seen it (and includes FritzingCheckPart.py)
Peter