Please help with python code

class CostException (Exception): def _init(self,msg,cost): super ()._init(msg) self.cost-cost # MSRP -Manufactured Sale Price class ShoppingItem): def init (self,name,msrp) if not isinstance (name, str): raise Exception ( "The name of the product must be a string" ) if len (name)-0: raise Exception ( "The name cannot be empty") if msrp self. msrp: raise CostException("No price gouging", price) self._currentPriceprice def str_(self): return(", originally st".format (self name,self. currentPrice, self. msrp))