What does pop(1) do in a list?

The method pop(index) in Python is used to remove an item from a list at a specified index and returns that item. When you call pop(1), it specifically targets the element at index 1.

In Python, list indices start at 0, meaning that the item at index 0 is the first item, the item at index 1 is the second item, and so on. Therefore, invoking pop(1) will remove and return the second item from the list.

For example, if you have a list like this: my_list = ['a', 'b', 'c'], calling my_list.pop(1) will remove 'b' from the list and return it, leaving my_list as ['a', 'c']. This demonstrates how pop(1) functions by specifying the index of the element to be removed.