Such expressions are often seen in definition of functions or methods, in forms of def f(*args, **kwargs) or a function call in form of f(*x) or f(**kwx), where x is a list of tuple, and kwx is a Python dictionary. When used in function definition, *args is meant to allow an arbitrary number of positional arguments to be passed to the function, whereas **kwargs is meant to allow an arbitrary number of keyword arguments to be passed to the function. When used in function calls, x in *x must be a list or tuple, or string, and * in *x acts like a operator to open the list, tuple or string and provide all the elements pf the list, tuple or string to the function in order, whereas **kwx is to open the dictionary and provide each item of the dictionary as a key-value pair to the function. Now you may be able to tell what statement print(*x) will do if x = [1, 2, 3, 4, 5]. Yes, it will print 1 2 3 4 5 on one line.