addcoin.py

def addCoin():
	coinlist = []
	
	while True:
		
		coinlist.append(input("\nPlease select a coin you want to track:\n").upper())
		
		print("\nThe list of coins you're currently tracking is: \n" + "\n".join(coinlist) + "\n")
		
		yesorno = input("Do you want to add another one? (Y/N): ").upper()
		
		if yesorno == "Y":
			continue
		
		else:
			break

	return coinlist

NameError: Name 'whatever I try to append' is not defined