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

not able to answer this

not getting output

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(d,l):
    return 

1 Answer

Steven Parker
Steven Parker
229,921 Points

:point_right: Here's a few hints:

  • you'll probably want a loop to iterate through the items in the list
  • for each list item, you'll want to test to see if it is "in" the dictionary
  • it it is, you'll increment a counter
  • after the loop is done, you can return the value in the counter

I'll bet you can do it now without an explicit spoiler.