In the below code, how is it repeatedly appending itself , when it is not in the loop?

Question

nums = [1, 2, 3]

print(nums)

# Making the list recursive.
nums.append(nums)

print(nums is nums[3])

print(nums[3][3][3][3])

Answer 1

𝐊𝐢𝐢𝐛𝐨 𝐆𝐡𝐚𝐲𝐚𝐥 is it a special case in python that if we use a.append(a) it produces recursive list instead of just appending only once ,the list a to the already existing list. I mean to ask
Like a=[1,2]
a.append(a)
instead of printing [1,2,[1,2]]
Is it a special case that it will keep on appending [1,2,[1,2,[1,2,[....]]]] and so on?