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

Kade Carlson
Kade Carlson
5,928 Points
Posted by Kade Carlson
Kade Carlson
5,928 Points

Not sure why this isn't working

What should I do here?

instances.py 
def combiner(arg):
    all_strings = []
    all_ints = []
    for item in arg:
        if item isinstance(item, str):
            all_strings.append(item)
        elif item isinstance(item, int):
            all_ints.append(item)
        else:
            None
    return all_strings.extend(all_ints)

2 Answers

Steven Parker
Steven Parker
231,007 Points
Steven Parker
Steven Parker
231,007 Points

Remember the objective: "Return a single string that is a combination of all of the strings in the list and then the sum of all of the numbers." So you'll need to join all the strings, and then add up all the numbers and convert the result to a string and join/concatenate that also.

Also, take another look at the tests in the loop. What happens when the item is a float?

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

Nikita Anuchin
Nikita Anuchin
13,713 Points
Nikita Anuchin
Nikita Anuchin
13,713 Points 
def combiner(args): #we know input data will be dict of str or (int, float) types
    my_str = '' #str placeholder 
    my_int = 0 #int, float
    for i in args:
        if isinstance(i, str): #if item type is str add it to my_str
            my_str += i
        else: 
            my_int += i
    return my_str + str(my_int) #convert int type to str and add it to my_str