PYTHON SHOPPING LIST Making a shopping list using python. I have everything down

Question

PYTHON SHOPPING LIST

Making a shopping list using python. I have everything down except the emptyList function. When I enter "-e" to empty the list, it returns empty, however the text still says "you have "number other than 0" in your list"

this is the instruction and my current code is down below!

emptyList
The final function we need to implement is emptyList. It will not work to set the value of theList to empty square brackets.

def emptyList():
    theList = []

Since you cannot set the value of the variable, you will need to manipulate the list object to remove the items within the list.

When the list is emptied, report this using a simple message.

# create a shared list

theList = []

def printMenu():

print('Here are the list of commands:')

print( '-p : Print the List')

print( '-e : Empty the List')

print( '-x : Exit')

print( '-h : Print this command list')

def addToList(item):

theList.append(item)

def getInput():

if len(theList) > 0:

print ('You have', len(theList),'in your list')

else:

print('You have your 0 items in your list.')

item = input('Enter an item or command: ')

item = item.strip(' ')

while item == (''):

print('Shopping list items cannot be blank')

item = input('Enter an item or command: ')

item = item.strip(' ')

return item

def printList():

print("Your shopping list:")

#loop to process the items

for item in theList:

#to print all the items in the list

print(" * "+item)

def emptyList():

theList.clear

print('The list is empty')

return len(theList)

def startProgram():

print('Welcome to the XYZ Shopping List Program')

def endProgram():

print('Thank you for using the XYZ Shoppling List Program.')

def main():

startProgram()

printMenu()

item = getInput()

while item != '-x':

if item == '-p':

printList()

elif item == '-h':

printMenu()

elif item == '-e':

emptyList()

else:

addToList(item)

item = getInput()

endProgram()

main()

Explanation / Answer

Shopping-List ============= # create a shared list theList = [] # open and or creat list file STLIST = open('slist.txt', 'r') # function to print out the command instructions def printMenu(): print("""Here are the list of commands: -p : Print the List -e : Empty the List -r : Remove item -x : Exit -h : Print this command list""") # function to screen items for duplicates and badapples, if the items passes these tests it will be added to the list. def addToList(item): if item in theList: print(item, ' already in list') elif item == 'badapple': print('unrecognized command') else: theList.append(item) return theList # function that let's the user know how many items are in the list and asks them to add an item. It tests to see if it is blank or not and if so reports that and asks them again. def getInput(): print('You have', len(theList), ' items on your list.') item = input('Enter an item or command: ') if item.isspace(): print(item, 'Shopping list items cannot be blank.') item elif item == None: print('shopping list items cannot blank.') elif item =='': print('Shopping list items cannot be blank.') else: return item # Prints out the running list items formated and numbered. def printList(): print('Your shopping list:') count = 0 for item in theList: count += 1 print(' ',str(count)+'.', item) #uses a loop to clear the contents of the list. def emptyList(): while len(theList) > 0: del theList[0] print('Shopping list is empty') # removes specif items from list. Checks to see if the item was mentioned or if its number was mentioned and removes just that item. def removeFromList(item): if item in theList: theList.remove(item) print(item, ' has been removed from list.') else: if item.isdigit(): n = int(item) del theList[n-1] print('item ', item, ' has been removed from list.') #function to print welcome message and start program and open and read file then close file. def startProgram(): print('Welcome to the XYZ Shopping List Program') readme = STLIST.readlines() readme += theList STLIST.close # function to end program. Prints end message and opens, writes and closes shopping list to a file. def endProgram(): print('Thank you for using the XYZ Shoppling List Program.') STLIST = open('slist.txt', 'w') STLIST.write(str(theList)) STLIST.close() #Main function calls the start function, the menu function, the getinput function, tests input for commands then if so runs commands, the runs exit function. def main(): startProgram() printMenu() item = getInput() while item != '-x': if item == None: item = getInput() elif item[0] == '-' and item[1] not in ['p', 'h', 'e', 'r']: item = 'badapple' elif item == '-p': printList() elif item == '-h': printMenu() elif item == '-e': emptyList() elif '-r' in item: removeFromList(item[3:]) else: addToList(item) item = getInput() endProgram() # calls main function! main()

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