"""
"""

def print_stuff(f):
    def new_function(x):
        answer = f(x)
        print(" DEBUG: f({}) = {} ".format(x, answer))
        return answer
    return new_function

@print_stuff
def f(x):
    return 2*x + 1

for i in range(3):
    y = f(i)

# --------------
    
class Foo:
    # Instances of this are also functions.
    def __call__(self, x):
        return 2 * x + 1

foo = Foo()
foo(3)

# -------------

def bar(*x):
    print(x)

bar(2,3,[5,10])

args = (2,3,4,5)
bar(*args)