Creating simple POS app using python

Python의 Dictionary를 이용해서 간단한 POS 앱을 작성합니다.

메뉴는 다음과 같이 구성됩니다.

 

----------Welcome to the supermarket--------------
1. 상품조회 View items 
2. 상품추가 Add items
3. 상품구매 Purchase items       
4. 상품검색 Search items
5. 상품변경 Edit items
6. 나가기 Exit 

 

Python 코드는 다음과 같습니다.

items=[]
while True:
	print("----------Welcome to the supermarket--------------")
	print("1. 상품조회 View items \n2. 상품추가 Add items\n3. 상품구매 Purchase items\n4. 상품검색 Search items\n5. 상품변경 Edit items\n6. 나가기 Exit ")
	choice=int(input("Enter the number of your choice: "))
	if choice == 1:
		print("------View Items------")
		print("The number of items in the inventory are: %d" %len(items))
		if len(items) != 0:
			print("Here are all the items available in the supermarket.")
			for item in items:
				for key,value in item.items():
					print("%s : %s" %(key, value))
	elif choice == 2:
		print("-----Add items------")
		print("To add an item fill in the form")
		item = {}
		item["name"] = input("Item name: ")
		while True:
			try:
				item["quantity"] = int(input("Enter the number of quantity: "))
				break
			except ValueError:
				print("Quantity should only be in digits")	
		while True:		
			try:
				item["price"] = int(input("Enter item price: "))				
				break
			except ValueError:
				print("Price should only be in digits")		
		print("Item has been successfully added.")		
		items.append(item)
	elif choice == 3:
		print("-----Purchase items------")
		print(items)
		purchase_item = input("Which item do you want to purchase? Enter name: ")	
		purchase_quantity = int(input("Enter the quantity needed: "))
		for item in items:
			if purchase_item.lower() == item["name"].lower():
				if item["quantity"] != 0:
					if purchase_quantity <= item["quantity"]:
						print("Pay %d at checkout counter" %(item["price"]* purchase_quantity))
						item["quantity"] -= purchase_quantity
					else:
						print("Quantity required is not available")	
				else:
					print("Item out of stock.")	
	elif choice == 4:
		print("-----Search items-----")
		find_item = input("Enter the item name to search in the inventory: ")
		for item in items:
			if item["name"].lower() == find_item.lower():
				print("The item named "  + find_item + "is displayed below with is details")
				print(item)
			else:
				print("item not found")
	elif choice == 5:
		print("------Edit items-----")			
		item_name = input("Enter the name of the item you want to edit: ")
		for item in items:
			if item_name.lower() == item["name"].lower():
				print("Here are the current details of " + item_name)
				print(item)
				item["name"] = input("Item name: ")
				while True:
					try:
						item["quantity"] = int(input("Enter item quantity: "))
						break
					except ValueError:
						print("Quantity should only be in digits")
				while True:
					try:
						item["price"] = int(input("Enter item price: "))
						break
					except ValueError:
						print("Price should only be in digits")
				print("Item has been updated")									
				print(item)
			else:
				print("Item not found")									
	elif choice == 6:
		print("-----Exited-----")			
		break
	else:
		print("You entered invalid option.")

 

실행화면 입니다.