How can I fix this?

Question

list1 = [1, 2, 3]
again = 'y'
while again == 'y':
number = input("Enter a number: ")
print("Is there another?")
again = input("Enter y for yes or n for no: ")
#Add input values onto the list
list1.append([number] * 2)

I want: list1 = [1, 2, 3, 4, 4, 5, 5, 6, 6]
What I'm getting is: list1 = [1, 2, 3, [4, 4], [5, 5], [6, 6]]

Answer 1

list1.append(number) ?

Answer 2

Use extend() instead of append().

lst = [1, 2, 3]
lst.extend([4]*2)
print(lst)
# [1, 2, 3, 4]