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Python Programming: how to write a program that allows user to add and remove items on a grocery list.?
def title():
print('Grocery List Program')
print('--------------------')
print()
print('At each > prompt, type +item_name to add an item to the'+
' grocery list, or')
print('type -item_name to remove an item from the list.' +
' Type DONE when finished.')
print()
def prompt_user():
item_prompt = input('> ') # get food items from user
item_prompt = item_prompt.strip()
return item_prompt.lower()
def obtain_list(item_prompt):
grocery_list = [] # create empty list
item_prompt = item_prompt.strip() # strips lead and trail spaces
while item_prompt != 'done': # control variable for loop
if item_prompt.startswith('+'):
grocery_list.append(item_prompt[1:])# appends item to list
print(item_prompt[1:].strip(), 'added to the list')
elif item_prompt.startswith('-'):
grocery_list.remove(item_prompt[1:])# removes item from list
print(item_prompt[1:].strip(), 'removed from the list')
else:
print('entry must begin with + or -, or type DONE when finished')
item_prompt = prompt_user()
for item_prompt in grocery_list:
print(item_prompt.strip())
def main():
title()
item_prompt = prompt_user()
obtain_list(item_prompt)
main()
this is the code i have so far but i cannot figure out how to print out a message saying that item was already added to the list or that item is not on the list.
example:
>+eggs
eggs added to the list
>+eggs
eggs is already on the list
>-bacon
bacon was not on the list
3 Answers
- 9 years agoFavorite Answer
This is all in Python 3.2.2, but here's some code I came up with that adds, removes, and displays items in a list: (be sure to indent correctly if you copy/paste)
groceryList = []
def mainMenu(): #displays the main menu...
print("\n--Menu--\n1.Add Item\n2.Remove Item\n3.See List\n4.Quit")
choice = int(input("> "))
return choice
def addItem():
#prompts for an item to add, and if the
#item is not in the list, it adds it
print("What item would you like to add?")
item = input("> ")
if item not in groceryList:
groceryList.append(item)
elif item in groceryList:
input("That item is already in your list.\n")
def removeItem():
#this is the same piece of code from below, in 'menuChoice == 3'
#but it has a delete function added in at the end
print("Your grocery list contains:")
i = 0
while i in range(len(groceryList)):
print(groceryList[i])
i = i + 1
print("What would you like to remove?")
item = input("> ")
if item not in groceryList:
input("That doesn't seem to be a part of your list.")
elif item in groceryList:
itemIndex = groceryList.index(item)
del groceryList[itemIndex]
menuChoice = mainMenu()
while menuChoice not in [1,2,3,4]:
#if you enter a number that isn't an option
#it returns you to mainMenu
print("invalid entry")
menuChoice = mainMenu()
while menuChoice in [1,2,3,4]: #I'm sure you get the idea....
if menuChoice == 1:
addItem()
menuChoice = mainMenu()
elif menuChoice == 2:
removeItem()
menuChoice = mainMenu()
elif menuChoice == 3:
#the following stuff just displays the list in a
#nice format, sort of like a list would be naturally written
i = 0
print("Your grocery list contains:")
while i in range(len(groceryList)):
print(groceryList[i])
i = i + 1
input("press enter...")
menuChoice = mainMenu()
else:
break
Source(s): I wrote this program. - 9 years ago
Hope this will help you.
