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Alex Rendon
7,498 Points"BUMMER expected a list, got <class: str>" Why this error appears, if the return is a list.
Is it a bug of the compilator of teamtreehouse? Or what is my error? help me please.
import random
itr=[1,2,3,4,5,6,7,8,9,10,11]
num=random.choice(itr)
def nchoices(itr,num):
return itr[:num]
2 Answers
William Li
Courses Plus Student 26,868 PointsHi, Alex, I think the logic of your code is a bit off here. This challenge asks you to write a function nchoices(), it takes 2 arguments, first argument is an iterable, e.g. list, string, tuple ... etc; 2nd argument is an integer.
For example, if the second argument is 10, you function needs to randomly pick a number from the iterable argument 10 times, and each time append the picked value to a new list.
Here's one way to do it.
import random
def nchoices(iterable, n):
# Create a function named nchoices() that takes an iterable and an integer(n).
# return a list of n random items from the iterable where n is the integer.
result = [] # empty list placeholder
while n > 0: # execute while loop as long as n is greater than 0
result.append(random.choice(iterable)) # pick one random item from iterable and append to result list
n -= 1 # decrement n by 1, so that n will eventually approach the loop termination condition.
return result # after the loop is finished, result list is the return value of this function.
Alexander Davison
65,469 PointsI have the answer! It wanted the list, not the list item. I hope that solved it! :D
Alex Rendon
7,498 PointsAlex Rendon
7,498 PointsHey William, thanks very much. You have helped me so much.