I'm using pyzotero.

Some functions I built:

Dump all your collections (folders) recursively

def dumpAllCollections(zot):

Find a collection reference by name

def findCollectionByName(zot, name):

Dump all items within a collection

def dumpItemsOfCollection(zot, col):

Update the publication and year fields of all items within a collection. You can probably derive more useful functions from it.

def updateItemsOfCollection(zot, col, publication, year):