I've been helping a friend use parts of your framework, but their recipes consisted of multiples of one item, and I had to change the check_ingredients function to accommodate that, and I thought I would share here if anybody else needs that too
def check_ingredients(craftitem):
# Count how many of each ingredient is required
from collections import Counter
required = Counter(craftitem.cost)
for item_id, needed in required.items():
if inv.count(item_id) < needed:
return False
return True
