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 String Formatting with Dictionaries

Posted by Chris Campisi
Chris Campisi
1,226 Points

** must be mapping, not list error

The string used before the defined function must be filled in by members of the dictionary further above. These two need to be used to create a list with the string already filled in by the values of the dictionary. By example on the video it seems like using **my_dict should work.

strings.py 
dicts = [
    {'name': 'Michelangelo',
     'food': 'PIZZA'},
    {'name': 'Garfield',
     'food': 'lasanga'},
    {'name': 'Walter',
     'food': 'pancakes'},
    {'name': 'Galactus',
     'food': 'worlds'}
]

string = "Hi, I'm {name} and I love to eat {food}!"

def string_factory(my_string, my_dict):
    my_list = []
    for x in my_string:
        my_list.append(x.format(**my_dict))
    return my_list

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

Here is your corrected code

def string_factory(my_dict, my_string):  # <-- list of dict is first parameter
    my_list = []
    for x in my_dict:  # <--  loop through list of dicts
        my_list.append(my_string.format(**x))  # <-- format using dict contents
    return my_list