Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Collections (Retired) Dictionaries Membership

Posted by Katy Ullrich
Katy Ullrich
1,648 Points

compare list and dictionary

Not sure if I've started this correctly. Can someone give some guidance?

counts.py 
# You can check for dictionary membership using the
# "key in dict" syntax from lists.

### Example
# my_dict = {'apples': 1, 'bananas': 2, 'coconuts': 3}
# my_list = ['apples', 'coconuts', 'grapes', 'strawberries']
# members(my_dict, my_list) => 2
def members(my_dict, my_list):
  if my_dict{}==my_list[]
    return

1 Answer

Tyler Espinoza
Tyler Espinoza
4,838 Points
Tyler Espinoza
Tyler Espinoza
4,838 Points

I think you'll want to try a for loop to start the function off because you'll want to go through each different item in the list to check for membership. Maybe something like

for item in list:
    if item in my_dict:
          #code here