What's the difference between list1 = [] list2 = [] and list1 = list2 = [] in python?

Question

I just started using python and I am trying to initialize two lists using list comprehensions. Like this

list1 = list2 = [0.0] * 57

When i do

Answer 1

The first one sets list1 and list2 to both refer to the same list. The second one defines a new list for each name.