topic Re: Question re: list.extend in Python Questions

Question re: list.extend

KennethKirkeby — Tue, 26 Jan 2016 21:35:14 GMT

I'm a new Python student. Using a loop, I need to add to a list. The following is not working. Not sure what I'm missing or if my logic is bad.

#Variables

myList = []

item = ''

#Create name list

item = raw_input("Please enter a name or blank to quit: ")

while item <> '':

myList.extend(item)

printmyList

Traceback (most recent call last):

File "C:/Users/ken/Desktop/HW4b.py", line 14, in <module>

myList.extend(item)

MemoryError

Thanks ... Ken

Re: Question re: list.extend

BillDaigle — Sat, 11 Dec 2021 19:52:55 GMT

myList = []

item = ''

#Create name list

item = None

while item <> '':
    item = raw_input("Please enter a name or blank to quit: ")
    myList.append(item)
print myList

You need to ask for a new input on each iteration of the loop.

Re: Question re: list.extend

KennethKirkeby — Tue, 26 Jan 2016 22:34:20 GMT

Had to add the brackets to ITEM or the list was individual letters.

myList = []

Item = 'None'

while item <> '':

item = (raw_input("Please enter a number (Blank to quit): "))

myList.extend([item])

printmyList

************************************************************

Please enter a number (Blank to quit): Ken

Please enter a number (Blank to quit): Jim

Please enter a number (Blank to quit): Bill

Please enter a number (Blank to quit):

['Ken', 'Jim', 'Bill', '']

Re: Question re: list.extend

Luke_Pinner — Tue, 26 Jan 2016 23:37:33 GMT

Use .append instead of .extend - paraphrased from the python docs:

list.append(x)
Add an item to the end of the list;
list.extend(L)
Extend the list by appending all the items in the given list

i.e append is for adding a single item to the list, extend is for adding multiple items in a list to the list