In one word yes they are. Lists in python are mutable. This means that you can easily change the list once created. Say for example you are a lazy, smart kid 👶👩‍💻 just like me, so you made a ...

foo()` creates a new list each time it's called, instead of modifying an existing one. Accidental modification of mutable data types in Python, such as lists and dictionaries, is a common pitfall.

You might ask why this modification of integer/number values is not possible. The first reason is for efficiency. If Python already knows that the value of integers won’t be modified it can ...