What's the difference between the square bracket and dot notations in Python?

Question

I come from a Javascript background (where properties can be accessed through both . and [] notation), so please forgive me, but what, exactly, is

Answer 1

[] is the index to a container, such as a list or dictionary.

. is the member of an object and modules. It can be a method, member data, or attribute.

>>> xs = [1, 7, 3, 4, 5, 4, 3, 4, 1]

>>> xs.count(4)
3

>>> xs[1]
7