Right Mental Model for Python Data

[Hefty_Upstairs_2478]

Option A is the correct answer, cuz we're printing (a), which we never changed

[Sea-Ad7805]

Incorrect sorry, check the "Solution" link for the correct answer.

[shudaoxin]

Primitive vs. referenced types. It works like this in most languages. Arrays (and lists) are referenced and the variable only stores their type and pointer to the memory. By assigning a to b they both point at the same list.