n= [1,2,3,4] # Add your function here def list_extender(lst): n.append(9) return n print list_extender(n) I cannot understand what is wrong: It seems simple and I got the correct output right screen but it gives the error: Oops, try again. list_extender([1, 2, 3, 4]) returned [1, 2, 3, 4, 9, 9] instead of [1, 2, 3, 4, 9] Can you please explain?
You want to manipulate the list that's being sent as a parameter (
lst), append a number to this list and return this list.
It gives the same error. Both in mine and yours I got the correct result : [3, 5, 7, 9] but the error message says there are two 9s in the list. If I were to reset it, it seems like:
n = [3, 5, 7] # Add your function here print list_extender(n)
So n is already something different what is asked for. There must be a problem. How can I sove this?
lets go back to your original code:
n= [1,2,3,4] # Add your function here def list_extender(lst): n.append(9) return n print list_extender(n)
now, you pass
n as argument in the function call:
# function call + argument print list_extender(n)
n is copied into
lst (the function parameter), this we can verify:
def list_extender(lst): print lst
so then you want to extend
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