# Using a list of lists in a function

#1

I get this error message "Oops, try again. flatten([[1, 2], [3, 4]]) returned [1, 2, 3, 4, 5, 6, 7, 8, 9] instead of [1, 2, 3, 4]" even though the black dialog box shows [1, 2, 3, 4, 5, 6, 7, 8, 9]

``````n = [[1, 2, 3], [4, 5, 6, 7, 8, 9]]
def flatten(lists):
results = []
for lists in n:
for numbers in lists:
results.append(numbers)
return results

print flatten(n)``````

#2

your function only works for a single list, this not very efficient. The great thing about function is that they can do the same task multiply times

What if you want to flatten another list:

``````n = [[1, 2, 3], [4, 5, 6, 7, 8, 9]]
def flatten(lists):
results = []
for lists in n:
for numbers in lists:
results.append(numbers)
return results

print flatten(n)
print flatten([[1,2],[3,4]])``````

make your function work for more then 1 list

#3

4 posts were split to a new topic: Using a list in a function

#8

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