Quick Check: Python Class Methods and Static Methods

Review

1. What does Python supply as the first argument to a class method?

   A class method receives the class as its implicit first argument, conventionally named cls.
2. What implicit argument does a static method receive?

   A static method receives no implicit self or cls argument.
3. Why is cls useful in an alternate constructor?

   Using cls allows cls(...) to construct the class used for the call, including a subclass.
4. Which statement about calling a class method through an instance is correct?

   When a class method is accessed through an instance, its implicit first argument is still the class of that instance.
5. When is a static method usually the clearest choice?

   Static methods receive no implicit object, so they fit helpers that need only their explicit arguments.