Question on the Random Choices Objective

I keep getting the error "Bummer! Expected 5 items, got 10." I have tried sending empty variables, declaring them outside the function, and everything else I can think of. When I run this script I get a something like "['a', 'b', 'c', 'a', 'c']" as my solution.

What is going wrong? I have had this problem before where the challenge program was sending things in for me, but I can never figure out what to change to get it to work correctly. Is there any way I can get the Challenges to show me debugging information?

#Create a function named nchoices() that takes an iterable and an integer. 
#The function should return a list of n random items from the iterable where n is the integer. Duplicates are allowed.
import random
list = []
def nchoices(str,n):
    for x in range(n):
        list.append(random.choice(str))
    return list

print(nchoices(('a','b','c'),5))

EDIT: I solved it. Should have realized it was running the function for me, but my question about a debugger still stands

import random
def nchoices(str,n):
    list = []
    for x in range(n):
        list.append(random.choice(str))
    return list