About remove() in python

Question

I have dought about the following code
a=[1,2,3,4,5]
for n in a:
a.remove(n)
print(a)

the output is [2,4], why not it is [ ]

Answer 1

The list is updated dynamically while you iterate over it. First you remove the first element (1). The updated list looks like this: [2,3,4,5]. Then you remove the second element which is now 3 and the list looks like this: [2,4,5]. Then you remove the third element (5) and the list looks like this: [2,4].

Answer 2

that's very informative thank you