Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Python Basics (Retired) Putting the "Fun" Back in "Function" Shopping List Redux

Empty shopping list items

When this code is running, if I press "enter" without inputting any text the code still adds an item to the list, so I have an empty or null item. What would be the best way to prevent creating these empty items? This is the part of the code for the new_item input:

while True: new_item = input("> ")

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,166 Points

One way to reject empty input would be to check if input is the empty string then continue the loop for the next input:

while True:
    new_item = input("> ")
    if new_item == "":

    # remain input processing code here
Kenneth Love
Kenneth Love
Treehouse Guest Teacher
if new_item:

should be sufficient. An empty string is false-y.