*args and **kwargs unpacking

Question

Accepted Answer

The * operator unpacks a list (or any iterable) into positional arguments: add(*[1,2,3]) becomes add(1,2,3). The ** operator unpacks a dict into keyword arguments: add(**{'a':10,'b':20,'c':30}) becomes add(a=10,b=20,c=30). This is extremely useful for passing arguments dynamically - common in decorators, API wrappers, and test factories.