Unexpected Result from Heapify Function in Python

Question

I ran the following piece of code

from heapq import heappop,heappush,heapify
nums = [12,3,-2,6,4,8,9]
heapify(nums)
print(nums)

And got the following results: [-2, 3, 8, 6, 4, 12, 9] But I expect the following results: [-2,4,3,12,6,8,9] since I expect we are pushing each item fropm nums (starting from 12, and one by one) into an empty list while maintaining heap data structure. Could anyone give me some guidance why I am wrong?

Answer 1

I think it's named _siftup is because (at CS lectures), the parent node is also called the root node, so when the function is wrote up, the tree is upside down for them