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

Dennis Stephens
Dennis Stephens
2,864 Points

Not passing in code challenge but terminal out is correct

Create a function named combiner that takes a single argument, which will be a list made up of strings and numbers. 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. For example, with the input ["apple", 5.2, "dog", 8], combiner would return "appledog13.2". Be sure to use isinstance to solve this as I might try to trick you.

instances.py
def combiner(arg):
    strlist = ''.join([x for x in arg if isinstance(x, str)])
    intlist = sum([x for x in arg if isinstance(x, int)])
    new_list = strlist+str(intlist)

    return new_list

1 Answer

Steven Parker
Steven Parker
231,261 Points

Not all numbers are int.

In fact, the example given in the instructions includes a float value.

But you're really close. Just add "or isinstance(x, float)" to the conditional in your second comprehension and you should have it.