Wanted to assign barcode to inventory product also wanted to print barcode from erpnext in barcode level printer.
no option like that so far
you can not generate and print barcode in ERPNext, but if you have programming knowledge, it is opensource you can create your own module 
(This is what they say every time if a user wants something that ERPNext does not have ), but you are right this is an ERP and an ERP should have a barcode management system.