Make a list of lists where the last value of list is incremented

December 15, 2021

I want to make a list of lists where each sublist will have its second value greater than the second value of its predecessor.
e.g.
my list_of_lists = [[1, 1], [1, 2], [1, 3], [1, 4],…]

I thought this would do it but I can’t see why it is not appending the correct current version of the list.

Code

mylist = [1,1]
mylist_of_lists = []
for i in list(range(1,11,1)):
    print("i: ", i)
    mylist[1] = i
    print("mylist : ", mylist)
    mylist_of_lists.append(mylist)
    print("mylist_of_lists : ", mylist_of_lists)
print(mylist_of_lists)

Console return

i:  1
mylist :  [1, 1]
mylist_of_lists :  [[1, 1]]
i:  2
mylist :  [1, 2]
mylist_of_lists :  [[1, 2], [1, 2]]
i:  3
mylist :  [1, 3]
mylist_of_lists :  [[1, 3], [1, 3], [1, 3]]
i:  4
mylist :  [1, 4]
mylist_of_lists :  [[1, 4], [1, 4], [1, 4], [1, 4]]
i:  5
mylist :  [1, 5]
mylist_of_lists :  [[1, 5], [1, 5], [1, 5], [1, 5], [1, 5]]
i:  6
mylist :  [1, 6]
mylist_of_lists :  [[1, 6], [1, 6], [1, 6], [1, 6], [1, 6], [1, 6]]
i:  7
mylist :  [1, 7]
mylist_of_lists :  [[1, 7], [1, 7], [1, 7], [1, 7], [1, 7], [1, 7], [1, 7]]
i:  8
mylist :  [1, 8]
mylist_of_lists :  [[1, 8], [1, 8], [1, 8], [1, 8], [1, 8], [1, 8], [1, 8], [1, 8]]
i:  9
mylist :  [1, 9]
mylist_of_lists :  [[1, 9], [1, 9], [1, 9], [1, 9], [1, 9], [1, 9], [1, 9], [1, 9], [1, 9]]
i:  10
mylist :  [1, 10]
mylist_of_lists :  [[1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10]]
[[1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10], [1, 10]]

Desired output

my list_of_lists = [[1, 1], [1, 2], [1, 3], [1, 4],…]