documentation confusion

[simonmcnair]

I've been using pyexiftag for a while, and I don't understand the method by which it works. if exiftool you can have '-=' '+=', but in the python tool, I assume you can only accomplish that by using execute ?

In addition some of the tags are strings, some are lists, some have a max length. When a string is used, generally you also need to specify a delimiter ? I'm confused as to what pyexiftool does in all these cases, and would request, possibly, that the documentation is made clearer ?

My apologies if I have got the wrong end of the stick, or am plain wrong. Both exiftool and pyexiftool are complex tools and implementations.